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Quartz & Prehnite

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RAF57081

Quartz & Prehnite

Description Tabs

Description
Locality: 
Goboboseb Mountains, Brandberg, Dâures, Erongo Region, Namibia
Size Range: 
Thumbnail (1-3cm)
Size: 
2.8 × 1.3 × 1.2 cm
Largest Crystal: 
2.80cm
Description

Prehnite crystals on quartz.  The quartz crystal is clear, though the pictures show it as milky.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

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