HEMIMORPHITE SPECIMEN -CHINA 325.40 CTS [MX 6906]

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Dimensions (mm) not provided
Weight (carats) not provided
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Certified Gemstone

HEMIMORPHITE SPECIMEN.

This is a natural untreated specimen from Yunnan prov China.

Weight 325.40 cts app

Size 53 x 44 x 31 mm app

Hemimorphite, is a sorosilicate mineral which has been mined from days of old from the upper parts of zinc and lead ores, chiefly associated with smithsonite. It was often assumed to be the same mineral and both were classed under the same name of calamine. In the second half of the 18th century it was discovered that there were two different minerals under the heading of calamine - a zinc carbonate and a zinc silicate, which often closely resembled each other.

The silicate was the more rare of the two, and was named hemimorphite because of the hemimorph development of its crystals. This unusual form, which is typical of only a few minerals, means that the crystals are terminated by dissimilar faces. Hemimorphite most commonly forms crystalline crusts and layers, also massive, granular, rounded and reniform aggregates, concentrically striated, or finely needle-shaped, fibrous or stalactitic.

$80.00 USD

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Auction ID 305997
Watchers 8 watching
Viewed 1,472 times
Starts 28th Oct 2012 11:43pm PDT

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