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Forrestania Rubellite pegmatite (Mount Hope pegmatite), Mount Holland pegmatite field, Yilgarn shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 32° 11' 14'' South , 119° 47' 41'' East
Latitude & Longitude (decimal): -32.18741,119.79489
GeoHash:G#: qdm0vuryz
Locality type:Pegmatite
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Gem grade pink tourmaline has been extracted from this site, however the pegmatite is intensely weathered. It is located 124 kilometres south of Southern Cross, in a gold and nickel mining region called Forrestania. The mine is presently (2012) leased by Fred Rose, who sells specimens from the mine on Ebay.

Kim Robinson accidently discovered the pegmatite while searching for nickel sometime between 1971 to 1976. Rubellite chips came up with the drill cuttings. He mined the site for tantalum in the early 1980's discovering the new species kimrobinsonite, which is an alteration mineral of stibiotantalite. During this time, about 200 kilograms of manganotantalite and microlite concentrates had been produced from approximately 3000 tonnes of ore. He also produced 1 400 carats of gem rubellite, and some of this was the finest gem-grade tourmaline produced in Western Australia. Mining ceased by the late 1980's and around 2000, the lease was purchased from Kim Robinson by Fred Rose, who has since conducted mining here for specimens.

The pegmatite is within a north trending greenstone belt, and both the greenstone and pegmatite are covered by a red-brown laterite layer. The pegmatite is 1-4 metres thick, dipping gently to the north, with a pit 75-150 metres long, 30-50 metres wide, and 18 metre deep, together with a small shaft near the north-western rim of the pit.

The pegmatite is severely weathered both physically and chemically, with much of the feldspars, albite and microcline, altered to clay. Further, fracturing and brecciation of unweathered core sections have altered some of the minerals left. What zoning can be seen show a hanging and footwall zone of medium grained albite-quartz with schorl, microcline-quartz intermediate zone, and quartz-cleavelandite-lepidolite core.

This central section has produced pink tourmaline, and rarely green tourmaline, clear quartz crystals and pink morganite. Fist-sized schorl crystals are said to be common at the west end of the pegmatite. Stibiotantalite and Kimrobinsonite are found in the underground workings. Kimrobinsonite is white, chalky, friable mineral to 5 mm, associated with black cesstibtantite (the first time the species was discovered in Western Australia).

One truckload of Giles Pegmatite rock was dumped at Mt Holland during the 1980's by Kim Robinson with the intent of processing it, composed of curly albite with columbite and muscovite masses. This material is said to be still found around the dumps, and does not belong to Mt Holland.
lat -32.17984
Long 119.7898
Co-ord 763041 mE, 6436217 mN


Mineral List


19 valid minerals. 1 (TL) - type locality of 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

Archean
2500 - 4000 Ma



ID: 885515
metamorphosed ultramafic rocks 74286

Age: Archean (2500 - 4000 Ma)

Description: Metamorphosed komatiite, pyroxenite, chlorite-tremolite schist, talc-chlorite schist, anthophyllite-tremolite-talc rock; olivine-cummingtonite schist; talc-carbonate-tremolite-chlorite rock, serpentinite; amphibole schist after pyroxenite

Comments: igneous ultramafic volcanic; meta-igneous ultramafic intrusive; synthesis of multiple published descriptions

Lithology: Igneous ultramafic volcanic; meta-igneous ultramafic 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]

Neoarchean - Mesoarchean
2500 - 3200 Ma



ID: 3193082
Archean crystalline metamorphic rocks

Age: Archean (2500 - 3200 Ma)

Comments: Yilgarn Craton

Lithology: Gneiss

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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nickel, E. H., Robinson, B. W., (1985) Kimrobinsonite, a new tantalum mineral from Western Australia, and its association with cesstibtantite. The Canadian Mineralogist: 23: 573-576
Calderwood, M.A., Grguric, B.A., Jacobson, M.I. (2007) Guidebook to the Pegmatites of Western Australia. Hesperian Press, Carlisle, Western Australia.
Minedex Database, Western Australian Geological Survey, 2006

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