標 本 名: | 灰重石 (Scheelite)
| 化学組成: | Ca[WO4] (approx. 3 wt% ReO3) | サ イ ズ: | | 重量: | | 透明: | | 数量: | | 産地: | Koksha Valley (Kokscha; Kokcha), Badakhshan (Badakshan; Badahsan) Province, アフガニスタン (Afghanistan)
| Scheelite crystal from Afghanistan, a very rarely found species for this location. Unusual is that this piece is containing up to 3 wt% Rheniumtrioxid !! The maximum concentration in molybdenum ores is up to 0.2w%. The crystal itself discloses an unblemished euhedral shape (far better seen in person).
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