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White Rock Quarry, Horsnell Gully, South Mt Lofty Ranges (Adelaide Hills), Mt Lofty Ranges, South Australia, Australiai
Regional Level Types
White Rock QuarryQuarry
Horsnell GullyGully
South Mt Lofty Ranges (Adelaide Hills)Mountain
Mt Lofty RangesMountain
South AustraliaState

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Lock Map
Latitude & Longitude (WGS84): 34° 55' 31'' South , 138° 42' 30'' East
Latitude & Longitude (decimal): -34.92528,138.70833
GeoHash:G#: r1f9k6h3d
Locality type:Quarry
Köppen climate type:Csb : Warm-summer Mediterranean climate
Nearest Settlements:
Norton Summit319 (2011)1.5km
Adelaide Hills60,394 (2013)1.6km
Wattle Park1,830 (2015)3.0km
Ashton481 (2011)3.1km
Kensington Gardens2,508 (2015)4.3km

The quarry lies in the Stoneyfell Quartzite Group, which is in turn part of the Adelaide Geosyncline. It is believed, to have formed during the late Proterozoic thru to the end of the Cambrian (approx 900-500 million years ago).

The quarry itself is well known for its large clear crystals of quartz, showing many different forms, from single crystals thru to multiple crystal groups. It is especially well known for its spectacular ‘Japan Law’ twinned specimens. It is also known for producing some of the largest 'totally clear' crystals in Australia.

The South Australian Museum has dedicated an entire display case to the specimens of White Rock Quarry. It is quite surprising and somewhat upsetting to see that we only have 5 specimens currently (as of 6th April, 2012), showing here on Mindat! I know many collectors that have numerous specimens from this locality, all of which are great examples of this locality.

All access and collecting is now prohibited; mainly because of people sneaking into the quarry to collect without permission.

Located 10km east of Adelaide.

Regions containing this locality

Australian Plate (Australia Plate)Tectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

1 valid mineral.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
var: Rock Crystal4.DA.05SiO2

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Unclassified Minerals, Mixtures, etc.
var: Rock Crystal-SiO2

List of minerals for each chemical element

O Quartz (var: Rock Crystal)SiO2
O QuartzSiO2
Si Quartz (var: Rock Crystal)SiO2
Si QuartzSiO2

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

541 - 1000 Ma

ID: 3186197
Neoproterozoic sedimentary rocks

Age: Neoproterozoic (541 - 1000 Ma)

Comments: Adelaide Fold Belt

Lithology: Sandstone,shale,limestone,siltstone,tillite,dolomite

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]

635 - 720 Ma

ID: 705397
Burra Group

Age: Cryogenian (635 - 720 Ma)

Stratigraphic Name: Burra Group

Description: Siltstone, laminated; shale; sandstone, heavy mineral lamination, quartzose to feldspathic, cross bedding; dolomite, blue-grey to pale pink, lenticular.

Comments: argillaceous detrital sediment; synthesis of multiple published descriptions

Lithology: Argillaceous detrital sediment

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, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ludbrook, N. H., 1980 , A guide to the geology and mineral resources of South Australia , Govternment Printer, Adelaide.
Noble, R.J., Just, J, & Johnson, J. E., 1983 , Catalogue of South Australian minerals : 1983 , Dept. of Mines and Energy, South Australia, Adelaide.

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