|Latitude & Longitude (WGS84):||30° 48' 16'' South , 118° 2' 35'' East|
|Latitude & Longitude (decimal):||-30.80442,118.04311|
|Köppen climate type:||BSh : Hot semi-arid (steppe) climate|
The pegmatite is located 25 kilometres north west of Mukinbudin, and 50 metres north of Cosh's South Pegmatite. It is named after Kevin and Patricia Cosh, who own the farm the pegmatite is on. Also known as Whyte's South pegmatite. No mining or test pits have been made on the pegmatite, which is a mass of white quartz and topaz at ground level, surrounded by wheat fields.
The largest recovered topaz crystal in Western Australia, weighing 45 kilograms, has come from this pegmatite. The site is said to hold glassy white to yellow (from iron staining) topaz crystals and crystal fragments, one to forty kilograms in weight, with some being gem quality. The pegmatite is likely to contain more topaz under the surface, but no exploration has been made for this. It is likely to remain that way, as the deposit is on private property. Topaz cleavage masses are common in Western Australian pegmatites, but are often overlooked.
4 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
0 - 2.588 Ma
Age: Pleistocene (0 - 2.588 Ma)
Comments: regolith; synthesis of multiple published descriptions
Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). 
|Neoarchean - Mesoarchean|
2500 - 3200 Ma
|Archean crystalline metamorphic rocks|
Age: Archean (2500 - 3200 Ma)
Comments: Yilgarn Craton
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.