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Wolframite

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LGM1042878

Wolframite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
Valdeflórez, Cáceres, Extremadura, Spain
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 6.5 × 2.5 cm
Weight: 
148.00gr
Description

Wolframite crystals with lustrous cleavage faces grown in iron-stained quartz matrix.

The locality "Valdeflórez, Sierra de la Mosca, Cáceres, Cáceres, Extremadura, Spain" is a Tin deposit, consisting of pneumatolytic cassiterite- and montebrasite-bearing veins hosted by clay schists. The deposit was occasionally worked for both cassiterite and montebrasite. The mine was abandoned in the 1970s. (cit. mindat)

Originally from old Dr. Krantz stock, comes with antique K. v. Steinwehr label.
Kurt von Steinwehr was born April 5, 1871 in Konigsberg (modern Kaliningrad, Russia, german until World War II). He was an engineer by profession and also collected minerals and coins, among other things. He began collecting insects in 1889 in East Prussia, and in 1891 relocated to Cologne where he collected specimens throughout the Rhine area. In 1900 he donated his collection of butterflies to the Cologne Natural History Museum, and another collection he donated to the Koenig Museum in Bonn in 1936. His collection of coins and medals was sold at auction in 1934. He died May 13, 1958 in Oerlinghausen, Germany.

Mineral Data
What's on the rock

Wolframite

Synonym Of: 

Hübnerite

Formula: 
MnWO4
Strunz: 
4.DB.30
Hardness: 
4.0 - 4.5

Ferberite

Formula: 
FeWO4
Strunz: 
4.DB.30
Hardness: 
4.0 - 4.5
Formula: 
(Fe2+)WO4 to (Mn2+)WO4
Crystal System: 
Monoclinic
Hardness: 
4 - 4.5
Colour: 
Greyish-black
Streak: 
Reddish Brown

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$15
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Shipping Information

Postage Area Price
Germany (trackable & insured, up to 5 kg)
7
EU countries (trackable, up to 2 kg)
13
Switzerland and UK (trackable, up to 2 kg)
18
Rest of World (trackable, up to 2 kg)
22.50

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.

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+++IMPORTANT+++
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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.

Bid History

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