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Tiptopite Montgomeryite & Roscherite

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ESM629462

Tiptopite Montgomeryite & Roscherite

Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile , South Dakota, United States of America
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
0.5 × 1.7 × 1.3 cm
Description

Colourless tiptopite crystals on red-brown montgomeryite with brown roscherite

Mineral Data
What's on the rock

Tiptopite

Formula: 
K2(Na,Ca)2Li3Be6(PO4)6(OH)2·H2O
Strunz: 
8.DA.25
Hardness: 
3.5
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

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

Roscherite

Formula: 
Ca2Mn2+5Be4(PO4)6(OH)4·6H2O
Strunz: 
8.DA.10
Crystal System: 
Monoclinic Tabular crystals or platy aggregates
Hardness: 
4.5 - 0.0
Streak: 
White
Type Locality: 
Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany
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