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Cosh's North pegmatite, Mukinbudin, Mukinbudin Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 30° 48' 16'' South , 118° 2' 35'' East
Latitude & Longitude (decimal): -30.80442,118.04311
GeoHash:G#: qdeby0hr5
Locality type:Pegmatite
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.


Mineral List


4 valid minerals.

Rock Types Recorded

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Regional Geology

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

Quaternary
0 - 2.588 Ma



ID: 785672
colluvium 38491

Age: Pleistocene (0 - 2.588 Ma)

Description: Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite

Comments: regolith; synthesis of multiple published descriptions

Lithology: Regolith

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). [5]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 3189638
Archean crystalline metamorphic rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Amphibolite/granulite grade orthogneiss

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. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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Calderwood, M.A., Grguric;, B.A., Jacobson, M.I., (2007): Guidebook to the Pegmatites of Western Australia; Hesperian Press, Perth, 2007.

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