Deposit No. 1677, Subashi (Subashen), Aketao Co. (Akto Co.; Aqto Co.), Kezilesu Autonomous Prefecture (Kizilsu Autonomous Prefecture; Qizilsu Autonomous Prefecture), Xinjiang Autonomous Region, China
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Proterozoic metamorphic rocks, mainly biotite-plagioclase gneiss and dolomitic marble, that are intruded by a granite gneiss stock, granite pegmatites, diopside-albitite dykes and aplite veins. Gneiss and marble along the contact with the dykes contain gem-quality scapolite (marialite) and titanite crystals.
The scapolite crystals are transparent to translucent, show lilac-pink or various shades of purple colours and measure 1.5-3 cm x 0.3-1 cm on average, but can be up to 12 cm long and up to 5 cm across. They are composed of marialite and contain small amounts of chromium, which is responsible for their colour. The titanite crystals are transparent to translucent honey-yellow, show tabular to tabular-prismatic habits and measure 4 x 1 cm on average, but can be up to 15 cm long and up to 9 cm across.
4 valid minerals.
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Yanling Tang (2005): Non-metallic mineral deposits of Xinjiang, China [Zhongguo Xinjiang Fei Jinshu Kuangchuang]. Geological Publishing House (Beijing), 289 pp. (in Chinese)