Pyramid Hill granite quarry (Mawson's Quarry), Pyramid Hill, Loddon Shire, Victoria, Australia
|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 ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
17 valid minerals.
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.
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358.9 - 382.7 Ma
|Pyramid Hill Granite|
Age: Late Devonian (358.9 - 382.7 Ma)
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).