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Fransoletite Tiptopite & Hurlbutite

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BCK716340

Fransoletite Tiptopite & Hurlbutite

Martin Jensen collection
Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.2 × 2.1 × 0.8 cm
Description

You are bidding on an exceptionally rich thumbnail collected by Martin Jensen in October of 1981 at the Tip Top Mine during his graduate studies. The sample hosts dozens and dozens of white tabular fransoleite crystals with abundant sprays of both thin needles and thick hexagonal prisms of tiptopite with pale pink montgomeryite and minor colorless spheres of hurlbutite and other species. Beautiful and rich sample of these rare species! 

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

Hurlbutite

Formula: 
CaBe2(PO4)2
Strunz: 
8.AA.15
Crystal System: 
Orthorhombic
Hardness: 
6.0
Streak: 
White
Type Locality: 
Chandlers Mill Quarry, Newport, Sullivan Co., New Hampshire, USA

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