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Bornite Chalcopyrite & Quartz

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MNT598776

Bornite Chalcopyrite & Quartz

ex Dr. F. Krantz, Bonn, GER; ex Groom-Napier?
Classic Locality

Description Tabs

Description
Locality: 
Cornwall, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.1 × 3.5 cm
Description

Cornish classic but no mine specified: the specimen looks like a conglomerate of slightly rounded quartz pebbles with a "cement" of blueish tarnished (what i think) bornite and some chalcopyrite. Comes out of the Charles Ottley Groom-Napier Cornwall stock at Krantz, GER, but has no old label.

Mineral Data
What's on the rock

Bornite

Formula: 
Cu5FeS4
Strunz: 
2.BA.15
Crystal System: 
Tetragonal
Hardness: 
3.0
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0

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