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Tourmaline & Adularia

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MGR784244

Tourmaline & Adularia

Description Tabs

Description
Locality: 
Stak Nala, Gilgit-Baltistan, Pakistan
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.8 × 3 cm
Description

Typical sample from Stak Nala - dark tourmaline crystals - sharp and lustrous with transparent areas below the pyramidal end-points. This one is really attractive - the crystals are free-standing and on matrix, without any repairs and as special feature you can see tiny crystals of sencond generation - they grow at the end-point of the main crystal - this really a very attractive and more uncommon detail.

Mineral Data
What's on the rock

Tourmaline

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

Adularia

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Crystal System: 
Monoclinic
Hardness: 
6 Ortho - clase