The deep wine red crystal ( cm across) is almandine, Fe3Al2Si3O12 (iron aluminum silicate). It is the most common of the garnets and is typical of garnet schists like the one shown here. Garnets often form euhedral (showing well developed faces) crystals, and two shapes of faces can be seen in this sample. Almandine is used as an abrasive, and transparent crystals are prized as gems. Natural almandines are never pure, and usually contain some magnesium, calcium, or other elements not represented in almandine's formula. from USA ▹ Alaska. Near Wrangell.

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Size: 2602px × 1675px
Location: New Jersey
Photo credit: © Historic Illustrations / Alamy / Afripics
License: Royalty Free
Model Released: No

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