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countable and uncountable, plural almandines
(mineralogy) A type of garnet having a deep red color, inclining to purple, with the chemical formula Fe3Al2(SiO4)3. quotations examples
Almandine, the variety found here, is stable at temperatures of 540 to 900°C at a pressure of 200 GPa.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 164