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Montgomeryite & Englishite

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Montgomeryite & Englishite

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
0.2 × 1.8 × 1.1 cm
Description

Orange-red sprays of montgomeryite crystals  with white englishite crystals

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

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