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Tourmaline & Phengite

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PDM800253

Tourmaline & Phengite

Description Tabs

Description
Locality: 
South Africa
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.4 × 7.2 × 2.6 cm
Description

Aggregates of black tourmaline associated to lustrous greenish phengite. The crystals are well exposed at both sides of the specimen.

With and old handwritten label, it was obtained in 1969 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).

Mineral Data
What's on the rock

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Crystal System: 
Trigonal
Hardness: 
7

Phengite

Variety Of: 

Muscovite

Formula: 
KAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Hardness: 
2.5
Hardness: 
0.0

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