One of a collection of seven photographs of Amygdales polished by Dr G Baker CSIRO 1950. A fully coloured plate of the originals was to have appeared in the book "Phillip Island in Picture & Story".Black & White photograph of an Amygdale Stone."Phillip Island Amygdale - magnified 5 diam. Colours greyish brown with edges white".phillip island, amygdale stone, dr g baker, joshua w gliddon

One of a collection of seven photographs of Amygdales polished by Dr G Baker CSIRO 1950. A fully coloured plate of the originals was to have appeared in the book "Phillip Island in Picture & Story".Black & White photograph of Amygdale Stone"Yellow, also some green & red. Magnified about 3 diam."phillip island, amygdale stone, dr g baker, joshua w gliddon

One of a collection of 7 photographs of Amygdales polished by Dr G Baker CSRO 1950. A fully coloured plate of the originals was to have appeared in the book "Phillip Island in Picture & Story". Black & White photograph of an Amygdale Stone."Brown chiefly. Magnified about 3 diam"phillip island, amygdale stone, dr g baker, joshua w gliddon

One of a collection of seven photographs of Amygdales polished by Dr G Baker CSIRO 1950. A fully coloured plate of the originals was to have appeared in the book "Phillip Island in Picture & Story".Sepia coloured photograph of polished Amygdale stone."This was the least attractive of the set. We still have it. Magnified about 5 diam. " Brown edges cream centre.phillip island, amygdale stone, dr. g baker, joshua w gliddon

One of a collection of seven photographs of Amygdales polished by Dr G Baker CSIRO 1950. A fully coloured plate of the originals was to have appeared in the book "Phillip Island in Picture & Story".Sepia photograph of Amygdale Stone polished by Dr G Baker C.S.R.O. 1950"Probably the best. It had chiefly a blue centre then otherwise red, yellow and brown. Magnified about 5 diam.amygdale stone, phillip island, dr. g. baker, joshua w gliddon

One of a collection of seven photographs of Amygdales, polished by Dr G Baker CSRO 1950. A fully coloured plate of the originals was to have appeared in the book "Phillip Island in Picture & Story". Black & White Photograph of an Amygdale Stone. Circular image with multi patterned interior."Phillip Island Amygdale. Magnified 5 diam. Colours chiefly brown and yellow."phillip island, amygdale stone, dr g baker, joshua w gliddon

One of a collection of 7 photographs of amygdales polished by Dr G Baker CSRO 1950. A fully coloured plate of the originals was to have appeared in the book "Phillip Island in Picture & Story".Black & White photograph of an Amygdale Stone - outer ring and inner ring with patterned centre."Phillip Island Amygdale magnified 5 diam. Colours red & yellow."phillip island, amygdale stone, dr g baker, joshua w gliddon

Although it is not known where these specimens were collected, Victoria and other regions of Australia were surveyed for sites of potential mineral wealth throughout the 19th Century. The identification of sites containing valuable commodities such as gold, iron ore and gemstones in a locality had the potential to shape the development and history of communities and industries in the area. The discovery of gold in Victoria, for instance, had a significant influence on the development of the area now known as 'the goldfields', including Beechworth; the city of Melbourne and Victoria as a whole. Agate occurs when amygdales (gas pockets) form in the upper levels of basaltic lava flows. If these pockets or bubbles are iniltrated by water bearing silica in solution, the fluid dries and hardens in layers, forming round or egg shaped nodules or geodes within the rocky matrix. Agate is formed of a silica mineral chalcedony similar to quartz. The term carnelian primarily refers to the reddish shading of the stone; whether the stone is termed an agate or chalcedony type is often influenced by the degree of colour banding the specimen shows. The specimens are significant as examples of surveying activity undertaken to assess and direct the development of the mineral resource industries in Victoria and Australia, as well as the movement to expand human knowledge of earth sciences such as mineralogy and geology in the nineteenth century.Three small geological specimens that appear visually consistent with images of rough or unpolished Carnelian Agate or Chalcedony. geological specimen, geology, geology collection, burke museum, beechworth, indigo shire, north-east victoria, gemstones, agate, carnelian