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Segelerite Collinsite & Robertsite

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BCK714830

Segelerite Collinsite & Robertsite

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: 
3.3 × 3 × 1.4 cm
Description

You are bidding on an exceptional thumbnail from the Martin Jensen collection with dozens of perfect light green prisms of segelerite on matrix with bladed sprays of collinsite, hundreds of spheres of robertsite, leucophosphite and other minerals on ferrisicklerite. Very rich paragenesis and an amazing piece from Tip Top. Martin did his graduate studies at the Tip Top mine and self-collected many of his best Tip Top specimens. 

Mineral Data
What's on the rock

Segelerite

Formula: 
Ca2 Mg2 Fe3+2(PO4)4(OH)2·8H2O
Strunz: 
8.DH.20
Hardness: 
4.0
Streak: 
White
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Collinsite

Formula: 
Ca2(Mg,Fe2+)(PO4)2·2H2O
Strunz: 
8.CG.05
Hardness: 
3.0 - 3.5
Type Locality: 
Francois Lake phosphate occurrence, Francois Lake, Omenica Mining Division, British Columbia, Canada

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

Seller Information

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