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Fransoletite & Robertsite

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SMM759794

Fransoletite & Robertsite

Type Locality
Rare Mineral

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.2 × 0.5 cm
Description

White tabular crystals of rare fransoletite scattered on more points, stand out on a crystalline carpet of brown-greenish robertsite that cover one face of the matrix. The Tip Top mine is the type and only locality known for fransoletite. Very good and rare specimen.

Boxed with Label
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

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

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