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RM3770 Tangeite and Volborthite
Druse of dark green tangeite crystals —a calcium copper hydroxyl vanadate—associated with lighter, yellowish-green volborthite crystals. The specimen exhibits slight radioactivity, likely due to the presence of carnotite and/or tyuyamunite within the sandstone matrix.
Size: 5.2 x 3.8 x 2.7 cm.
Presents radioactive activity ☢.
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