Hematite

Hematite: Iron Oxide (Fe₂O₃) crystallizing in the Trigonal System as rhombohedral, short, flattened, and sometimes lamellar crystals; metallic gray, black, or reddish in color; density 4.95–5.26 g/cm³; Mohs hardness 5–6.5.

ematite
(Photo: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0/Wikimedia Commons, License CC BY-SA 3.0)

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