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the hardest mineral (Mohs 10) with octahedra, trigons, and cube forms; matrix and alluvial crystals prized for pristine appearance and provenance.Diamond from Diamantina, Brazil
Diamantina, Brazil — famed alluvial diamonds from Proterozoic conglomerates; rounded octahedra to rhombododecahedra and historic subdistricts that collectors s…
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