The R.A.G. gemological laboratory in Turin (Italy) recently received some sample of a deep green stony material of very unusual appearance, but somewhat resembling jadeites or nephrites. To understand the nature of this material we submitted it to some standard gemological testing and analytical procedures. The sample is a portion of methamorphic, probably low grade rock, showing some preferred orientation (schist) of phyllosilicate, whose color is due to the high amount of fuchsite, the smaragd-green variety of muscovite, that owe its nice sfumatura to the chromium content.
A deep-green fuchsite-rich rock
COSTA, Emanuele;
2011-01-01
Abstract
The R.A.G. gemological laboratory in Turin (Italy) recently received some sample of a deep green stony material of very unusual appearance, but somewhat resembling jadeites or nephrites. To understand the nature of this material we submitted it to some standard gemological testing and analytical procedures. The sample is a portion of methamorphic, probably low grade rock, showing some preferred orientation (schist) of phyllosilicate, whose color is due to the high amount of fuchsite, the smaragd-green variety of muscovite, that owe its nice sfumatura to the chromium content.
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