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Chatoyant quartz with cinnabar inclusions. While on a buying trip to Jaipur, India, one of these contributors (TP) purchased a 4.56 ct cabochon of what appeared ...
Gems & Gemology, Winter 2011, No. 47-4, pp. 322-323

Chatoyant quartz with cinnabar inclusions. While on a buying trip to Jaipur, India, one of these contributors (TP) purchased a 4.56 ct cabochon of what appeared to be quartz with iron oxide inclusions, such as those seen in “strawberry” quartz from Kazakhstan. The cabochon measured 10.4 × 8.7 × 6.8 mm and had a vitreous luster (figure 10). Its spot RI of ~1.54, SG of 2.64, and inert reaction to long- and short-wave UV were all consistent with quartz. The gem was vivid red under reflected light except for a narrow linear near-colorless band. Most interestingly, it displayed chatoyancy in fiberoptic light, appearing as a four-rayed star in some positions. Microscopic examination revealed that the phenomenon was due to numerous red inclusions. These were short (