by Konstantinos Kourtidis, Demokritus University of Thrace, Xanthi, Greece
The Smoke quartz chemical formula is SiO2. The crystal system is trigonal. Smoke quartz orginates from colorless quartz, that changes colour because of exposure to radioactivity. The one in the photo, found near Little Rock, has been artificially exposed.
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Konstantinos Kourtidis (distributed via imaggeo.egu.eu)