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Segelerite & Bobdownsite

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BCK212249

Segelerite & 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: 
1.1 × 0.8 × 1.2 cm
Description

You are bidding on a small specimen with a vug containing some nice tabular greenish segelerite crystals with tiny clusters of bobdownsite and minor robertiste. There are also some nodules of Mn-oxides(?) on the segelerite crystals.

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

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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