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Tiptopite Montgomeryite Robertsite Englishite & Roscherite

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SER1153992

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Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
9.1 × 5.6 × 4.1 cm
Description

an extremely rich specimen featuring a carpet of pink orange montgomeryite blades hosting several tufts of colourless tiptopite, orange roscherite, white balls of englishite and dark red bals of robertsite

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

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

Englishite

Formula: 
K3Na2Ca10Al15(PO4)21(OH)7·26H2O
Strunz: 
8.DH.55
Crystal System: 
Monoclinic
Hardness: 
3.0
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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Start 03 Mar 18:00
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