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Mineralpedia Details for Almandine

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Almandine

Almandine

Named after a corruption of the word alabandicus, which was used to describe stones, likely Almandine, that were found or worked on at the ancient gem cutting center in Alabanda, Turkey, which is also considered the type locality. Almandine is the most common garnet and can be found in hundreds of widespread localities around the world including as fine crystals in localities in Austria, Sweden, Norway, the United States, Brazil, Zimbabwe, Australia, and Japan. Generally found in schist and gneiss that formed from regionally metamorphosed argillaceous sediment and pelites, but can also be found in contact metamorphic hornfels, granites, eclogites, sedimentary rock, and as a detrital mineral.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/almandine.pdf

Formula
Fe2+3Al2(SiO4)3 
Crystal System
Isometric 
Crystal Habit
Equant crystals, rounded grains, typically well-formed dodecahedra or trapezohedra 
Cleavage
None 
Luster
Vitreous - Resinous 
Color
brown, brownish red, red, black, black red 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Conchoidal 
Hardness
7-8 
WebMineral
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Mindat
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