Eisenkiesel SiO2
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Eisenkiesel SiO2

by Konstantinos Kourtidis, Demokritus University of Thrace, Xanthi, Greece

Eisenkiesel (a German term, translating to Iron Quartz). A quartz that is turned opaque red with hematite inclusions. From Johannesschacht mine, Woelsendorf, Oberpfalz, Germany.