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Pyramid Hill granite quarry (Mawson's Quarry), Pyramid Hill, Loddon Shire, Victoria, Australia

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Latitude & Longitude (WGS84): 36° 3' 37'' South , 144° 8' 35'' East
Latitude & Longitude (decimal): -36.06028,144.14306
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Two quarries, one abandoned, the other operated by E.B. Mawson and Sons, have been excavated on the low granite knolls south of the main Pyramid Hill peak in the Terricks Range, in northern Victoria. The granite varies from even-grained to coarsely porphyritic, and contains quartz, cream to white microperthitic feldspar, albite-oligoclase, biotite and muscovite. Small andalusite crystals are present. In the operating quarry, aplite and pegmatite veins occur, as well as pegmatitic patches and miarolitic cavities lined with quartz, microcline, albite and muscovite. Aggregates of black schorl crystals are common, but masses of pale blue topaz are rare. The Pyramid Hill granite is a fractionated S-type with similar P contents to the Lake Boga Granite. In the Pyramid Hill quarry, fluorapatite crystals are much less abundant than at Lake Boga. Cream to dark greyish green crystals up to several centimetres across and druses of colourless crystals several millimetres across have been collected.


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


17 valid minerals.

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

Late Devonian
358.9 - 382.7 Ma



ID: 928057
Pyramid Hill Granite

Age: Late Devonian (358.9 - 382.7 Ma)

Stratigraphic Name: Pyramid Hill Granite

Description: Coarse-grained, intrusive leucocratic monzogranite

Comments: igneous felsic intrusive; synthesis of multiple published descriptions

Lithology: Igneous felsic intrusive

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]

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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Birch, W. D. (1996): Portlandite and other recent mineral discoveries in the granites at Lake Boga, Wycheproof and Pyramid Hill, Victoria. Australian J. of Mineralogy 2 (2), 47-50.

Mineral and/or Locality  
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