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Pararobertsite & Bobdownsite

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BCK220487

Pararobertsite & Bobdownsite

Type Locality

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Size Range: 
Thumbnail (1-3cm)
Size: 
1.8 × 1.4 × 1.1 cm
Description

You are bidding on a small matrix specimen with some very good bladed, extremely rare pararobertsite crystals on quartz with rhombs of bobdownsite. Very good sample of this rare phosphate from the type locality.

Mineral Data
What's on the rock

Pararobertsite

Formula: 
Ca2Mn3+3(PO4)3O2·3H2O
Strunz: 
8.DH.30
Crystal System: 
Monoclinic
Hardness: 
2.0
Streak: 
Brown Red
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Bobdownsite

Formula: 
Ca9Mg(PO4)6(PO3F)
Group Parent: 
Whitlockite Group
Strunz: 
8.AC.45
Hardness: 
5.0 - 0.0
Streak: 
White
Type Locality: 
Big Fish River, Dawson Mining District, Yukon Territory, Canada

Seller Information

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