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Hibschite & Chromite

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PDM798836

Hibschite & Chromite

Description Tabs

Description
Locality: 
South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
13.9 × 9.4 × 4.6 cm
Description

This is a big and very rich specimen composed almost exclusively by green microcrystals of hibschite, a grossular variety, with minor black microcrystalline chromite, a garnetite-chromitite rock. It is a representative block of "Transvaal Jade" or “Budstone”, and super rare in this size in collections. This rocks where originated by metamorphism of very old Paleoproterozoic rocks (~2000 million years old).

Ex Josef Verbist specimen, obtained before 1980 from Gilbert Gauthier, who carried out a collecting/buying trip in the early 1960’s throw Northern Rhodesia (Zambia), Southern Rhodesia (Zimbabwe), South Africa and South West Africa (Namibia).

Further info in: J. J. Frankel (1959). Uvarovite garnet and South African jade (hydrogrossular) from the Bushveld Complex, Transvaal. American Mineralogist 44, 5-6; 565–591.

Mineral Data
What's on the rock

Hibschite

Variety Of: 

Grossular

Formula: 
Ca3Al2(SiO4)3
Strunz: 
9.AD.25
Hardness: 
6.5 - 7.0
Formula: 
Ca3Al2(SiO4)3-x(OH)4x
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5
Streak: 
White
Type Locality: 
Mariánská Skála (Mariánská hora; Marienberg), Ústí nad Labem (Aussig), Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic

Chromite

Formula: 
Fe2+Cr3+2O4
Strunz: 
4.BB.05
Hardness: 
5.5
Colour: 
Black
Streak: 
Brown
Type Locality: 
Bastide de la Carrade, Gassin, Var, Provence-Alpes-Côte d'Azur, France...

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