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almandine garnet gem a t - Newest pictures
gemstones.peperonity.net

☹Gemstone Almandine☹

Almandine is the most common form of the gemstone Garnet. The term Garnet describes a group name for several closely related minerals that form important gemstones, and Almandine is an individual member mineral of the Garnet group. Almandine is usually opaque and unfit for gemstones use; though the less common transparent to translucent forms make fine gemstones. In the gem trade, the term Almandine is rarely used on its own. It is either generically called "Garnet", or "Almandine Garnet".
Chemical FormulaFe3Al2Si3O12
ColorRed, Black
Hardness7.5 - 8.5
Crystal System Isometric
Refractive Index1.780 - 1.810
SG4.3
Transparency Transparentto translucent
Double RefractionNone
Luster Vitreous
CleavageNone. May exhibit parting.
Mineral Class Almandine( Garnet)


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