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Perloffite & Mitridatite

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BCK720289

Perloffite & Mitridatite

Martin Jensen collection
Rare Mineral

Description Tabs

Description
Locality: 
Tip Top Mine, Fourmile, Custer County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 1.7 × 1.6 cm
Description

You are bidding on a small thumbnail from the Martin Jensen collection with a small area hosting tiny bright red clusters of perloffite crystals with green discoid clusters of mitridatite and minor jahnsite group. This is an extremely rare mineral from this famous mine and this is from the original and only known find of the mineral. The strange red crystals were analyzed by PXRD by Tony Kampf from a specimen out of the Tom Loomis collection of Tip Top minerals, and this specimen traded to Martin from Tom in 2010. This is a small piece of that sample and one of perhaps three known samples from the mine. 

Mineral Data
What's on the rock

Perloffite

Formula: 
Ba(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3
Strunz: 
8.BH.20
Hardness: 
5.0
Type Locality: 
Big Chief Mine (Johnson pegmatite), Glendale, Keystone District, Pennington Co., South Dakota, USA

Mitridatite

Formula: 
Ca2Fe3+3(PO4)3O2·3H2O
Strunz: 
8.DH.30
Crystal System: 
Monoclinic
Hardness: 
2.5
Type Locality: 
Kamysh-Burun Trough, Kerchenskoe deposit, Kerchenskyi (Fe)-ore basin, Kerch peninsula (Kertch peninsula), Crimea peninsula, Crimea Oblast', Ukraine...

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