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Montgomeryite & Whitlockite

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JYJ34694

Montgomeryite & Whitlockite

Rare Mineral

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Size Range: 
Small miniature (3-4.5 cm)
Size: 
1.1 × 3.7 × 1.4 cm
Description

Interesting piece with small crystals of montgomeryite and whitlockite.

Mineral Data
What's on the rock

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

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