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Montgomeryite & Bobdownsite

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BCK206122

Montgomeryite & Bobdownsite

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 1.6 × 0.6 cm
Description

You are bidding on a small specimen with some nice bladed groups of red montgomeryite on matrix with small groups of colorless bobdownsite crystals. As with a lot of these specimens some of the groups of crystals are a bit dinged but there are still several beautiful clusters.

Mineral Data
What's on the rock

Montgomeryite

Formula: 
Ca4MgAl4(PO4)6(OH)4·12H2O
Strunz: 
8.DH.25
Hardness: 
4.0
Type Locality: 
Clay Canyon, Fairfield, Oquirrh Mts, Utah Co., Utah, 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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