thorutite, Quartz
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Black thorutite spherules to 2 mm in diameter on a quartz crystal, 3.1 cm, from the Pedra Preta mine, Brumado. Reynaldo Contreira collection; Carlos Cornejo photo.
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Mineral guide
Learn about Quartz
a versatile mineral with clear, milky, and colored varieties; crystal forms, formation clues, and tips for identifying amethyst and citrine.Regional guide
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