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Hyalite & Yttrofluorite

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ESM1034435

Hyalite & Yttrofluorite

Description Tabs

Description
Locality: 
Sandamap Pegmatite, Sandamap North Farm 115, Dâures, Erongo Region, Namibia
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
0.5 × 1.5 × 1 cm
Description

A green yttrofluorite crystal with botryoidal hyalite aggregates on matrix

Mineral Data
What's on the rock

Hyalite

Variety Of: 

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Formula: 
SiO2·nH2O
Hardness: 
5.5 - 6.5
Streak: 
white

Yttrofluorite

Variety Of: 

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Hardness: 
4.0
Formula: 
(Ca1-xYx)F2+x where 0.05< x <0.3
Hardness: 
0.0