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Zanazziite Montgomeryite & Robertsite

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BCK717697

Zanazziite Montgomeryite & Robertsite

Martin Jensen collection
Classic 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: 
2.9 × 2.1 × 1.3 cm
Description

You are bidding on a nice thumbnail from the Martin Jensen collection that he obtained from the Black Hills Institute in 1983. These purple 'roscherite' crystals were from a very limited find and later shown to be at least in part zanazziite. There are hundreds of these crystals scattered across the matrix here with some bright red balls of montgomeryite blades and mounds of hexagonal barrels of robertsite. Very good sample of this rare type of roscherite from the Tip Top Mine. 

Mineral Data
What's on the rock

Zanazziite

Formula: 
Ca2Mg5Be4(PO4)6(OH)4·6H2O
Strunz: 
8.DA.10
Crystal System: 
Monoclinic
Hardness: 
5.0
Streak: 
White
Type Locality: 
Ilha claim, Taquaral, Itinga, Jequitinhonha valley, Minas Gerais, Brazil

Montgomeryite

Formula: 
Ca4MgAl4(PO4)6(OH)4·12H2O
Strunz: 
8.DH.25
Hardness: 
4.0
Type Locality: 
Clay Canyon, Fairfield, Oquirrh Mts, Utah Co., Utah, USA

Robertsite

Formula: 
Ca3Mn3+4(PO4)3O2·3H2O
Strunz: 
8.DH.30
Hardness: 
3.5
Streak: 
Red-brown
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

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