Spessartite Garnet (Spessartine)

Category  :  Mineral
Hardness  :  6.5 - 7.5
Gravity  :  4..15 (+.05, -.03)
Reflection  :  1.80
Color  :  yellow through red
Chemical formula  :  Mn3+2Al2(SiO4)3
Crystal system  :  Isometric - Hexoctahedral
Major varieties  :  Spessartine

The name is a derivative of Spessart in Bavaria, Germany, the type locality of the mineral. It occurs most often in granite pegmatite and allied rock types and in certain low grade metamorphic phyllites. The sources for gem quality spessartine are Sri Lanka and Brazil.[citation needed] Other sources include Australia, Burma, India, Israel, Madagascar, Tanzania (since late 2007) and the US. Spessartine of a orange-yellow is found in Madagascar (see "Mandarin garnet"). Violet-red spessartines are found in rhyolites in Colorado and Maine. Spessartine forms a solid solution series with the garnet species almandine.


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