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CHRYSOPRASE.
The chrysoprase is an apple-green chalcedony, sometimes olive-or whitish-green. It is translucent, scratches glass, and has the specific gravity of 2.56.
The color is due to the presence of oxide of nickel. This stone is found principally in Silesia, but also in Siberia and the United States.
Large pieces of chrysoprase are rare, and even the best specimens lose their color in course of time.
PRASE.
A translucent, spotted leek-green, green quartz, which loses its polish on exposure to the air, is known as prase.
This stone is found principally in the iron mines of Brietenbaum, Saxony, and also in Brittany, the Tyrol, Scotland, Salzburg, Finland, and the United States.
Prase is sometimes known commercially as "mother of emerald," and a greenish crystalline quartz is also often called prase. |
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Precious Stones Guide Vol 1
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