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Tiptopite Montgomeryite & Robertsite

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CAM113232

Tiptopite Montgomeryite & Robertsite

Ex Al Kidwell collection
Type Locality

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: 
3.5 × 1.8 × 2.2 cm
Description

Sprays of white acicular crystals of tiptopite on a bed of bright red montgomeryite crystals. Associated with small lustrous dark-brown robertsite crystals and some white blocky whitlockite crystals.
Type Locality for tiptopite and robertsite.
An small but excellent specimen, ex Al Kidwell collection.

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

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

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
Cartils Minerals

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