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Fransoletite Tiptopite & Montgomeryite

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BCK123724

Fransoletite Tiptopite & Montgomeryite

Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Size Range: 
Micromount (under 1cm)
Size: 
0.8 × 0.6 × 0.6 cm
Description

A small but very rich micromount containing at least two small crystals of extremely rare fransoletite with pink montgomeryite, clear needles of tiptopite, red roscherite, white englishite, and even a few minute balls of hurlbutite. From my personal Tip Top suite.

Mineral Data
What's on the rock

Fransoletite

Formula: 
Ca3Be2(PO4)2(HPO4)2·4H2O
Strunz: 
8.CA.05
Hardness: 
3.0
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

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

Seller Information

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