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Obsidian With Feldspar

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LGM840498

Obsidian With Feldspar

Ex Dr. Krantz, Bonn, Germany
With Antique Label

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Description Tabs

Description
Locality: 
Iceland
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
6 × 9.5 × 4 cm
Weight: 
182.00gr
Description

Piece of black, glassy obsidian showing white inclusions of "Krahlite", a mixture of orthoclase + plagioclase + quartz [Chester 147 (1892)]. "Krahlite" was described by Prof. Dr. Forchhammer in "Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefakten-Kunde 1844. "Im Obsidian von Hrafntinnabruggr auf Island finden sich rothe Kugeln mit konzentrisch-strahligem Gefüge, diese werden Krahlit genannt" (In the obsidian of Hrafntinnabruggr, Iceland, reddish spheres with concentric-radiating structure were found, they are called Krahlit).

This is a very old specimen, coming with a rare label from old 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

Feldspar

Group Parent: 
Feldspar Group

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.

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

+++IMPORTANT+++
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