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Spessartine (also called Spessartite) is a type of a garnet that is orange (it varies from reddish orange to brownish orange to yellowish orange). The chemical composition is Manganese Aluminum Silicate. Crystals vary from transparent to translucent. This relatively rare gem is found in Sri Lanka, Australia, Madagascar, Brazil, Sweden, Myanmar, China, and the U.S.
Mn3Al2Si3O12 - Manganese Aluminum Silicate
Class:
Subclass:
Group:
Red, orange, light brown to yellowish
White
Vitreous
Transparent to translucent
4.3
7 - 7½
None
Conchoidal to uneven
Perfect crystals, granular
Non-fluorescent
Frequency:
Abundant
Origin:
Magmatic in granitic pegmatites and some granites; hydrothermal in cavities in rhyolites; metamorphic in some skarns and Mn-rich metamorphic rocks.

Occurence:
Ramona, California, USA; Namibia; Nathrop, Colorado, USA; Minas Gerais, Brazil; China
Application:
Cut as a gemstone.

 
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