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Gold With Uraninite

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LGM1001784

Gold With Uraninite

ex Marcus Lueg personal collection
Classic Locality

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Description
Locality: 
Witwatersrand, Gauteng Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2.1 × 3.4 × 1.1 cm
Weight: 
7.90gr
Description

An interesting and super rare specimen from the Witwatersrand gold mining area. It hosts a veinlet of black uraninite and countless tiny gold flakes frozen in- and outside the uraninite.

This is a spectacular sample of precambrian high-grade gold ore. The rock is from the Carbon Leader (also known as the Carbon Leader Reef & Carbon Leader Seam), a blackened, hydrocarbon-rich stromatolitic interval richly impregnated with native gold (Au) and radioactive uraninite / pitchblende (UO2). It is a paleoplacer deposit, part of an ancient alluvial fan succession.
Stratigraphy & Age: Carbon Leader Member, Main Conglomerate, lower Johannesburg Subgroup, lower Central Rand Group, Witwatersrand Supergroup, lower Neoarchean, ~2.9 billion years old (cit. jsjgeology).

Slightly radioactive due to content of U (appr. 3.7 µSv/h within spitting distance).

From an old gold collection which was built up in the 70's, 80's and early 90's.

Mineral Data
What's on the rock

Gold

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

Uraninite

Formula: 
UO2
Strunz: 
4.DL.05
Crystal System: 
Isometric
Hardness: 
5.0 - 6.0
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Seller Information

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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+++
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