This particular geological specimen was found in Mount Franklin or Lalgambook in Djadjawurrung, located between Daylesford and Newstead, approximately ninety minutes drive from Melbourne. The mountain is an example of a breached scoria cone (a steep conical hill of loose pyroclastic fragments) which was created by a volcanic eruption about 470,000 years ago, a date which may indicate the age of this geological specimen. The volcanic eruptions of Mount Franklin were most likely witnessed by members of the Dja Dja Wurrung Aboriginal tribe, who referred to this country as the 'smoking grounds'. Mount Franklin and the surrounding area appears to have been a place of considerable religious significance to Aboriginal people, there is evidence which indicates that frequent large ceremonial gatherings took place in the area. Basalt is the most common rock on Earth’s surface, more than 90% of all volcanic rock on Earth is basalt. Basalt is an aphanitic extrusive igneous rock formed from the rapid cooling of low-viscosity lava exposed at or very near the surface of a rocky planet or moon. Specimens are black in colour and weather to dark green or brown. Basalt is rich in iron and magnesium and is mainly composed of olivine, pyroxene, and plagioclase. Olivine is the name of a group of rock-forming silicate minerals with compositions ranging between Mg2SiO4 and Fe2SiO4. Unlike other minerals, Olivine has a very high crystallisation temperature which makes it the first of the minerals to crystallise from magma. As magma cools, the crystals begin to form and settle on the bottom of the lava and form basalts that are abnormally enriched in olivine in the lower part of lava flows. According to H. M. King (on geology.com) "Olivine is thought to be an important mineral in Earth's mantle. Its presence as a mantle mineral has been inferred by a change in the behaviour of seismic waves as they cross the boundary between Earth's crust and mantle". Lava from Mount Franklin and other volcanoes in the area filled valleys and buried the gold bearing streams that became the renowned ‘deep leads’ of the gold mining era. In 1852, as part of the Victorian gold rush, gold was discovered in the immediate area, this gold was created by lava flows during the Newer Volcanic period, which were mined intensively during the nineteenth century. Around 1865 the presence of a deep lead in Mount Franklin was established. Deep lead mining was initially unsuccessful, and it was not until the late 1870s that the Franklinford Gold Mining Company mined at Mount Franklin on a significant scale. A few years later the Mount Franklin Estate Gold Mining Company also struck gold, followed by the Shakespeare and Great Western companies in the mid-1880s. By the late 1880s, however, deep lead mining had ceased in the area. Soon after gold was discovered in 1851, Victoria’s Governor La Trobe wrote to the Colonial Office in London, urging ‘the propriety of selecting and appointing as Mineral Surveyor for this Colony a gentleman possessed of the requisite qualifications and acquaintance with geological science and phenomena’. Alfred Selwyn was appointed geological surveyor in Australia in 1852 which began the Geological Survey of Victoria. In 1853-69 the Geological Survey issued under Selwyn's direction sixty-one geological maps and numerous reports; they were of such high standard that a writer in the Quarterly Journal of the Geological Society of London bracketed the survey with that of the United States of America as the best in the world. During his years spent in Australia, Selwyn collected numerous significant geological specimens, examples of which are held in collections such as the Burke Museum.This geological specimen is an example of basalt and olivine which shows the volcanic lava activity and geographical specific nature of Mt Franklin as a significant volcanic site. According to Agriculture Victoria 'The crater is one of the deepest in the Central Highlands area. It is a major megacryst site with some of the largest known Victorian examples of megacrysts of augite and an orthoclase. The small parasitic mound of Lady Franklin on the western flanks adds to the geological interest of the site'. This specimen also highlights the locality as a significant place for both indigenous activity and Victorian gold rush era mining practices. This specimen is part of a larger collection of geological and mineral specimens collected from around Australia (and some parts of the world) and donated to the Burke Museum between 1868-1880. A large percentage of these specimens were collected in Victoria as part of the Geological Survey of Victoria that begun in 1852 (in response to the Gold Rush) to study and map the geology of Victoria. Collecting geological specimens was an important part of mapping and understanding the scientific makeup of the earth. Many of these specimens were sent to research and collecting organisations across Australia, including the Burke Museum, to educate and encourage further study.An angular, solid hand-sized piece of grey volcanic Basalt with green/brown Olivine phenocrysts along one flat edge.Olivine in basalt / - label is probably / correct. / C. Willman / 15/4/21burke museum, beechworth, indigo shire, beechworth museum, geological, geological specimen, mineralogy, basalt, igneous rock, igneous-volcanic, volcanic geology, volcanic, olivine, olivine specimen, basaltoid

This specimen was recovered from the Nigretta Falls (previously named the Upper Wannon Falls), Victoria. The falls are fed by the Wannon River that has its head waters in the Grampians mountains. Approx. 10km upstream of the Wannon Falls, Nigretta is a multi-channel segmented cascade of smaller drops and bounces guided by patterns of joints in a much older (Devonian) rhyolitic volcanic rock. Both the Wannon and Nigretta Falls are iconic landscape features, entrenched in the history and identity of the region. These falls are particularly rare as they are the product of volcanic activity, which is unique in the context of the Volcanic Plain of Victoria. Waterfalls of this capacity are generally associated with the Uplands areas of Victoria, rather than the edges of the Volcanic Plain. This specimen is part of a larger collection of geological and mineral specimens collected from around Australia (and some parts of the world) and donated to the Burke Museum between 1868-1880. A large percentage of these specimens were collected in Victoria as part of the Geological Survey of Victoria that begun in 1852 (in response to the Gold Rush) to study and map the geology of Victoria. Collecting geological specimens was an important part of mapping and understanding the scientific makeup of the earth. Many of these specimens were sent to research and collecting organisations across Australia, including the Burke Museum, to educate and encourage further study. A solid, dark grey mineral specimen with pale terracotta coloured inclusions. Rhyodacite is a volcanic rock intermediate in composition between dacite and rhyolite. Rhyodacites form from rapid cooling of lava relatively rich in silica and low in alkali metal oxides.GEOLOGICAL SURVEY / R / S 55 FELSTONE PORPHYburke museum, beechworth, indigo shire, beechworth museum, geological, geological specimen, porphyritic rhyodacite, lava, nigretta falls, upper wannon falls, dacite, rhyolite, volcanic geology

tower hill, volcano, volcanic ash, volcanic ash layers, geology, koroit

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N23 Jan 1980 A43 Compressor unit in backyard of 39 Burlock Avenue

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N22Jan 1980 A43 Work on mole boring pit in 39 Burlock Avenue backyard

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N10 Dec 1979 A43 Filling at 29 Burlock Avenue

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N9 Dec 1979 A43 Filling behind 29 Burlock Avenue just off sewer line

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N11 Dec 1979 A43 Filling at 29 Burlock Avenue

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N31 Jan 1980 A43 Closeup of revolving airwinch near Hibberd's house

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N25 Jan 1980 A43 Grating over hole 37 feet deep in Chalkley's 41 Burlock Avenue (lot 8)

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N27 Jan 1980 A43 View along line work in Hibberd's and Chalkley's (lot 9 and 8)

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N32 Feb 1980 A43 Truck-mounted posthole digger that tried to sink shafts on MMBW sewer line behind 29-39 Burlock Avenue. Four feet wide, the auger could only go down one metre and was nearly useless.

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N26 Jan 1980 A43 View behind no. 39 Burlock Avenue showing compressor, mole pit cover and the big box tree

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N28 Jan 1980 A43 Line of sewer work with mole power pack near Hibberd's shed

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N30 Feb 1980 A43 View east, sewer work line showing grate over pit

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N1 Feb 1980 A43 Air winch over the hole in the corner of Chalkley's (lot 8)

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N3 Feb 1980 A43 Swivel crane over first hole west of boring pit in 39 Burlock Avenue. The track used to reach Burlock Avenue on left.

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E560 N29 Feb 1980 A43 View along MMBW work line in east end of Hibberd's, showing grating over mole boring pit

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N2 Feb 1980 A43 Final hole in lot 8 (no. 41) at the corner of Chalkly's

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N4 Feb 1980 A43 The boring hole, 39' deep, at lot 7 (Clarke's, 39 Burlock Ave) with the generator used to supply light.

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N6 Feb 1980 A43 Compressor of the tunnelling gang on the sewer line in Burlock Ave

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N5 Feb 1980 A43 Cars and caravans of the tunnelling gang in Burlock Ave

Part of a 43-photo record of the MMBW engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980."E565 N8 16 April 1980 A43 The pipe laying has been finished, now to cover it all in."

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E565 N11 28 April 1980 A43 The grip of the mechanical mole. The square at the bottom revolves, turning the sectioned shaft that carries the mole at its end.

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E565 N10 28 April 1980 A43 The "muscles" of the mechanical mole, driven by a hydraulic line from a powerful "power pack".

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N8 Feb 1980 A43 Line of tunnel shafts running from bottom centre to left of centre

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N12 Feb 1980 A43 Line of tunnel shafts at 29-30 Burlock Avenue showing swivel cranes 5 and 6 from the bore-hole in Lot 7

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E563 N2 12 April 1980 A43 MMBW compound in Evelyn Road gully

Part of a 43-photo record of the MMBW�s engineering feat in drilling a 12 inch pipe line up to 40 feet deep through rock hardened by volcanic action associated with geological fault that occurs along the line. The work took place from October 1979 to May 1980 on the southern boundary of Hubbard Reserve, North Ringwood. The collection was presented to the Ringwood Historical Research Group by J Clarke on 9th June 1980.E561 N7 Feb 1980 A43 Work on sewer tunnel below Burlock Avenue. Line of shafts running from manhole in gully to the consecutive groups on top left.