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Prehnite

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MGR790985

Prehnite

Description Tabs

Description
Locality: 
Merelani Hills, Arusha Region, Tanzania (United Republic)
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.9 × 1.8 cm
Description

A spectacular thumbnail from more recnet discoveries - the prehnite developed a free-standing sphere, consisting of uncountable tiny faces - all of them very lustrous. Fantastic quality for the mineral in general - the luster is exceptional and the intense yellow color is also very rare and uncommon for prehnite. No significant damages to report.

Mineral Data
What's on the rock

Prehnite

Formula: 
Ca2Al2Si3O10(OH)2
Strunz: 
9.DP.20
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Karoo dolerites, Cradock, Chris Hani District, Eastern Cape Province, South Africa