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Tiptopite Fransoletite & Robertsite

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ESM516841

Tiptopite Fransoletite & Robertsite

Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 2.4 × 1.6 cm
Description

Sprays of white acicular tiptopite crystals, spheres of brown robertsite, a rosette of white franselotite blades on a pale lavender whitlockite matrix

Mineral Data
What's on the rock

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

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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