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Boltwoodite On Calcite & Pyrolusite

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CLB506647

Description Tabs

Description
Locality: 
Goanikontes, Arandis, Erongo Region, Namibia
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.8 × 6.3 × 5.5 cm
Description

Very nice, orange-yellow tufts of acicular boltwoodite on calcite crystals with pyrolusite (psilomelane?) tips.

An extraordinary specimen. The crystals are very sharp. Somehow the radioactivity makes the pictures look out of focus.

Mineral Data
What's on the rock

Boltwoodite

Formula: 
(K,Na)(UO2)[HSiO4]·0.5H2O
Strunz: 
9.AK.15
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Pick's Delta Mine (Delta Mine; Pick's Mine), Delta, San Rafael District (San Rafael Swell), Emery Co., Utah, USA...

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Pyrolusite

Formula: 
MnO2
Strunz: 
4.DB.05
Hardness: 
2.0 - 6.5

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