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Chromium-dravite

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MGR723097

Chromium-dravite

Description Tabs

Description
Locality: 
Merelani Hills, Arusha Region, Tanzania (United Republic)
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 2 × 1.5 cm
Description

Just a small crystal - but quality is spectacular! The crystal shows modified end-points, sharp termination, perfect luster and a spectacular internal color - reminds to finest emerald and needs only minor backlight.

Mineral Data
What's on the rock

Chromium-dravite

Formula: 
Na(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
Group Parent: 
Tourmaline
Strunz: 
8/E.19-30
Crystal System: 
Trigonal
Hardness: 
7 - 7½
Colour: 
Dark emerald-green to greenish-black.
Streak: 
Greyish-green
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