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Article: Almandine


General Information about Almandine

  • Belongs to the garnet group
  • Name derived from alabandicus, used by Pliny the Elder
  • Iron alumina garnet with deep red to purple color
  • Often cut with a convex face, known as carbuncle
  • Shows three characteristic absorption bands when viewed through the spectroscope

Crystal Structure and Composition

  • Almandine is one end-member of a mineral solid solution series
  • Other end-member is the garnet pyrope
  • Crystal formula: Fe(SiO)
  • Magnesium can substitute for the iron with more pyrope-rich composition
  • Crystallizes in the cubic space group a3d, with a unit-cell parameter of approximately 11.512Å at 100K


  • Abundant in gem gravels of Sri Lanka, sometimes called Ceylon ruby
  • Violet-tinted almandine is known as Syriam garnet
  • Large deposits found in the Northern Territory of Australia, initially mistaken for rubies
  • Found in schistose rocks of the Zillertal in Tyrol
  • Almandine with partial magnesia substitution found at Luisenfeld in German East Africa

Uses and Properties

  • Almandine is used as an abrasive agent when crushed
  • Widely distributed in the United States
  • Fine crystals embedded in mica-schist found near Wrangell in Alaska
  • Specific gravity of 4.05+0.25−0.12
  • Luster ranges from greasy to vitreous

Cultural Significance and References

  • Connecticut has designated almandine garnet as its state gemstone
  • Almandine is listed in the Handbook of Mineralogy
  • References include publications such as Mineralogical Magazine and GIA Gem Reference Guide
  • Almandine is featured in Wikimedia Commons
  • Other related topics include a list of minerals and the state symbols of Connecticut

Almandine Data Sources

Reference URL
Knowledge Graph

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