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Whitlockite Englishite & Robertsite

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Whitlockite Englishite & Robertsite

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
1.1 × 0.3 × 0.2 cm
Description

A tiny but wonderful specimen featuring several yellow whitlockite (or bobdownsite) crystals hosting white tufts of englishite and red-brown robertsite

Mineral Data
What's on the rock

Whitlockite

Formula: 
Ca9Mg(PO4)6(HPO4)
Group Parent: 
Whitlockite Group
Strunz: 
8.AC.45
Crystal System: 
Trigonal
Hardness: 
5.0 -
Colour: 
Colourless, grey-white, light pink, light yellow; colourless in transmitted light
Type Locality: 
Palermo No. 1 Mine Grafton County, New Hampshire, 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

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