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Gold With Chalcopyrite & Rhodochrosite & Quartz

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LGM765936

Gold With Chalcopyrite & Rhodochrosite & Quartz

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
Mangani Mine, Sumatera Barat Province, Sumatra Island, Indonesia
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
3.5 × 8.5 × 4.2 cm
Weight: 
105.00gr
Description

Historic gold/silver ore sample consisting of quartz, chalcopyrite and fibrous rhodochrosite or manganoan calcite (pic 9) in matrix rock. Maybe there is some free gold present (center of pic 1), but it is difficult to be distinguished from the golden chalcopyrite on this specimen.

From old Dr. Krantz stock, comes with pencil writing on the backside of a printed A. Krantz label - such "recycling" labels were occasionally used by Krantz.
The Mangani mine, an abandoned gold mine, operated in the years 1912-32 and again in WW II from 1940-42.

Mineral Data
What's on the rock

Gold

Formula: 
Au
Strunz: 
1.AA.05
Crystal System: 
Isometric
Hardness: 
2.5 - 3.0

Chalcopyrite

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

Rhodochrosite

Formula: 
MnCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Cavnic Mine (Kapnikbánya), Cavnic (Kapnic; Kapnik), Maramureș Co., Romania

Quartz

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

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

Seller's terms and conditions

Thank you for viewing my auctions! Maintaining high standards in customer service is extremely important to me. If shipping takes longer than expected, please contact me. It is possible to file an investigation request, and during nearly ten years of e-rocks NO parcel was finally lost.

If for any reason you are not happy with any aspect of your transaction, please let me know as soon as possible, ideally within 1 week of receiving your specimen.

I will happily do all in my power to resolve the situation to your satisfaction.

+++IMPORTANT+++
Paypal is NOT accepted within Germany! I will charge a supplement of 2.5% for paypal payments within Germany. Bank transfer / offline payment is without costs and usually also completed within one day.
Within EU countries, bank transfer is also possible but not mandatory. I will offer free shipping or a discount in some cases. Please ask after receiving your invoice.

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