Almandine

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  1. An isometric mineral, 8[Fe32+ Al2 Si3 O 12 ] ; pyralspilite subgroup of the garnet group, with Fe replaced by Mg, Mn, and Ca; in red to brownish-black dodecahedral and trapezohedral crystals, or massive; Mohs hardness, 7-1/2; occurs in medium-grade metamorphic rock and felsic igneous rocks; used as a gemstone and an abrasive. Formerly called almandite; alamandine; almond stone.
  2. A violet or mauve variety of ruby spinel; a reddish-purple to purplish-red spinel.
  3. A reddish-purple sapphire (almandine sapphire).
    Source: Dictionary of Mining, Mineral, and Related Terms


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