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Comments: Blocky, crystalline aggregate of ferrotantalite crystals weighing over one kilogram.
Location: Ecuador, Minas Gerais, Brazil.
Scale: 10 x 6 x 5 cm.
© Rob Lavinsky
Comments: Rounded black crystal of ferrotantalite.
Location: Mount Surprise, Queensland, Australia.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species