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RM3664 Thorianite
From a classic locality for the species is coming this cubic thorianite crystal, good size, intense black color and brightness. The thorianite is a thorium oxide, almost always with some uranium content, the uranothorianite variety. This specimen contains about 5-6% by weight of uranium.
Size: 10.5 x 10 x 9.4 mm.
Presents radioactive activity ☢.
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