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Auktion: Natural History
wurde versteigert am: 12. Dezember 2010
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Ettringite on Matrix

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Zuschlagspreis:  2.440 $
Los-Nr. 1250, Aufrufe: 2

N'Chwaning Mines, Kuruman, Kalahari Manganese Fields, Northern Cape Province, South Africa Named for Ettringen, Germany after the discovery of its type locality in 1874, ettringite is a sulfate which originally formed as a precipitate from hydrothermal solutions. This specimen is from a small find at this famous old South African mine. Usually specimens from this region are formed of free-standing crystals without matrix. However, this particular specimen is unique in that it features translucent yellow-green crystals, measuring up to ¾ of an inch, on a dramatic black matrix covered with drusy micro-crystals. The luster shimmers and the hue of the crystals has a touch of golden yellow. Measures 2 3/8 x 2 x 1 in.

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Auktionshaus: Bonhams London
Titel: Natural History
Auktionsdatum: 12.12.2010
Adresse: Bonhams London
Los Angeles 7601 W. Sunset Boulevard Los Angeles CA 90046 Tel: +1 323 850 7500 Fax : +1 323 850 6090 [email protected]