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Stewartite & Robertsite

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BSM58274

Stewartite & Robertsite

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: 
3.9 × 3.8 × 1.9 cm
Description

Clusters of tiny pale yellow and sharp bladed crystals of stewartite together with deep red to black botryoids of robertsite on matrix. 

Also present are sprays of very tiny white acicular crystals - a note with the specimen states these are also stewartite, but it is possible they are strunzite.

Mineral Data
What's on the rock

Stewartite

Formula: 
Mn2+Fe3+2(PO4)2(OH)2·8H2O
Strunz: 
8.DC.30
Hardness: 
0.0
Streak: 
White
Type Locality: 
Stewart Mine (MS 6162; Stewart Lithia mine), Tourmaline Queen Mountain (Pala Mtn; Queen Mtn), Pala, Pala District, San Diego Co., California, 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

Seller Information

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