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Cronstedtite Siderite & Quartz

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MNT14861

Cronstedtite Siderite & Quartz

Ex Roger Lang (Germany)
Classic Locality

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Description
Locality: 
Hohe Warte Mine, Hagental, Harz, Lower Saxony, Germany
Size Range: 
Small cabinet (7-10 cm)
Size: 
5.5 × 8 × 4 cm
Description

Rare stuff: From the ancient fluorite mine, active from 1976 to 1984, came the best German specimens of the serpentine group mineral cronstedtite.

This one is a very good example with blackish cronstedtite aggregates overgrowing spherical siderite on matrix, being overgrown themselves by brownish patches of siderite(?) and minor pyrite.

Has been in my collection since 1992.

Mineral Data
What's on the rock

Cronstedtite

Formula: 
Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4
Strunz: 
9.ED.15
Crystal System: 
Monoclinic, Trigonal, Hexagonal
Hardness: 
3.5
Type Locality: 
Příbram, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Seller Information

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Seller's terms and conditions

Terms & Conditions

Thank you for your interest in my offers! Payment is possible via Paypal, bank transfer or cash if you pick up the item(s) personally. Bank data will be provided after settling the auction/transaction(s) if needed.

In case you are not happy with a specimen, you may send it back within 4 weeks. After receipt, i will refund the price minus shipping costs. Please inform me before sending an item back. If you have any questions (or maybe complaints) please feel free to contact me.

Best regards Roger

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