5.1 x 4.4 x 4.2 cm. Tin ore is very limited in the USA. Therefore, it is rare to see large crystals of the primary tin mineral, cassiterite. This one, in quartz, is doubly terminated, lustrous and twinned, with classic, re-entrant faces. The dark gray crystal measures 3.5 cm in length. This is undoubtedly a major American cassiterite and is by far ...
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