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Carnotite Calcite

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PPM1073888

Description Tabs

Description
Locality: 
Fall River, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.8 × 4.9 × 1.9 cm
Weight: 
30.00gr
Description

Nice specimen of rich, fibrous/accicular carnotite crystals on crystallized calcite matrix from an unusual American locality: Fall River, South Dakota. Measures ~25,000 CPM on my Ludlum Model 3 Counter with the 44-9 probe. From the noted collection of Chet Lemanski. Rare! 

Mineral Data
What's on the rock

Carnotite

Formula: 
K2(UO2)2(VO4)2·3H2O
Strunz: 
4.HB.05
Crystal System: 
Monoclinic
Hardness: 
2.0
Type Locality: 
Rajah Mine, Uravan District, Montrose Co., Colorado, USA

Calcite

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

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