Cassiterite crystals are rarely found large enough to produce cutting quality gemstones. Most sources of cassiterite today are found in alluvial deposits. Once found in Cornwall, England (the mines are now exhausted) the best source today are the tin mines of Bolivia, where it is found in hydrothermal veins. The present triangular-shaped stone of yellowish-brown hue stone is rare for its size. It is a classic collector’s gemstone.
Weighing approximately 13.66 carats and measuring 16.0 x 12.0 x 6.0mm

Date de cette photo : 13 juillet 2008 - 16:10
Envoyé par : Alain Truong

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Gemmes & Gemmologie : 149 photos