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Corundum

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LGM757433

Corundum

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
Craigmont Mine, Raglan Township, Renfrew County, Ontario, Canada
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
3 × 5 × 3 cm
Weight: 
110.00gr
Description

Two single crystals of corundum associated with mica. The color is blueish-grey. The larger crystal group shows some chatoyance when lighted in the right angle (see last pic, hard to photograph).

The Heidelberger Mineralien-Comptoir was one of the earliest mineral dealerships in Europe, tracing its roots back to 1804 when a 25-year-old tax inspector named Karl von Leonhard began occasionally dealing in minerals. Leonhard eventually became a prominent name among the mineralogists of Europe, having founded an important professional journal (which still exists) and published numerous books and articles. His mineral business grew in importance as well, and in time he passed on the management of the dealership to a succession of eager young men. The business ultimately operated for over 125 years, and during its heyday it was one of the leading such enterprises in the world, with a stock of over 40,000 specimens.

Size is given for the larger specimen, the smaller one is 3 x 2.5 x 2.5 cm.

Mineral Data
What's on the rock

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
9.0
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+++
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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.