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Segelerite Robertsite Collinsite & Leucophosphite

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BCK658427

Segelerite Robertsite Collinsite & Leucophosphite

Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.4 × 5.9 × 2.2 cm
Description

You are bidding on a large, fantastic sample from the Tip Top Mine. Rich druses of green segelerite crystals are present in numerous spots of the matrix among vugs lined with CO3-apatite crystals on which hundreds of balls of robertsite crystals are present. There are also nice bladed crystals of collinsite and purplish crystals of leucophosphite. The segelerite crystals get larger in some areas, but have been stained reddish-yellow by robertsite. A very rich specimen from the Kay Robertson collection!

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

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

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

Leucophosphite

Formula: 
KFe3+2(PO4)2(OH)·2H2O
Strunz: 
8.DH.10
Hardness: 
3.5
Streak: 
White
Type Locality: 
Ninghanboun Hills serpentinite, Weelhamby Lake, Perenjori Shire, Western Australia, Australia

Seller Information

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