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Tinsleyite & Bermanite

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BCK605935

Tinsleyite & Bermanite

Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 1.8 × 1.2 cm
Description

You are bidding on a small sample with exceptional, large purple crystals of tinsleyite in a vug of large and rich bermanite crystals. A broken crystal at the edge shows the yellow core of leucophosphite. A rare, analyzed sample collected by Janet Cares in 1976. 

Mineral Data
What's on the rock

Tinsleyite

Formula: 
KAl2(PO4)2(OH)·2H2O
Strunz: 
8.DH.10
Hardness: 
5.0
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Bermanite

Formula: 
Mn2+Mn3+2(PO4)2(OH)2·4H2O
Strunz: 
8.DC.20
Crystal System: 
Monoclinic
Hardness: 
3.5
Type Locality: 
7U7 Ranch (7-U-7 Ranch), Bagdad Mine area, Hillside, Eureka District, Yavapai Co., Arizona, USA

Seller Information

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