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Opal

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LGM683804

Opal

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
South Moravian Region, Czech Republic
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
5 × 7 × 4 cm
Weight: 
132.00gr
Description

"Cacholong" is an old designation for an opaque, highly porous opal. Here is a nice oldie from Moravia, Czech Republic. This specimen features greyish, layered opal var cacholong on volcanic rock matrix. There is a section with reddish structures, looking a bit like a fossil clam (see pic 2 & 3).

This is a very old specimen, coming with a rare label from Dr. A. Krantz dated to 1830-1850. The company's location "Berlin" at the bottom of the label gives a hint that the specimen dates back before the movement from Berlin to Bonn in 1850. The most of these old "Berlin" labels show a canceled "Berlin" and subsequent stamped "Bonn" for the new head office location.

Mineral Data
What's on the rock

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Streak: 
White

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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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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