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Cymophane

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56
GEMS.
for base has two rectangles. It is found enclosed in a matrix of white felspar, grey quartz, and granite.
However rare, it is not of much value, although it enjoys a special singularity ; when cut and polished it presents internal milky-blue reflections, which seem to follow the different inclinations given to the stone ; and this peculiarity has originated the name of cymo-phane given to this gem by Hauy.
Up to the present time it has only been procured from Brazil, Ceylon, Connecticut, in the United States, and Nortschink, in Siberia.
The cymophane of Brazil is generally found in frag­ments, of the specific weight of 3*7337. When ana­lysed, it gives
The cymophane of Ceylon is rather softer than the aquamarina of that island. When analysed it is found deficient in iron, which makes the colour lighter, and less inclined to green.
That from the Urals is coloured with chrome.
However, that from Brazil is better than all others.
Pliny gives the name of cymophane to a variety of greenish-yellow beryl.
Until Haüy had clearly distinguished the cymophane from all other stones, Verner believed it a chrysoberyl ; Lametherie, a chrysoprase ; and many others, an Ori­ental chrysolite.
Cymophane Page of 243 Clorophane
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