Mineral in Igneous Rock
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Hardness: 6.5-7.5 (Garnet), Color: Orange to reddish-brown, Luster: Vitreous, Crystal structure: Isometric (dodecahedral or trapezohedral crystals common), Cleavage: None (conchoidal fracture), Specific gravity: 4.19
- Hardness
- 6
Identified More mineral in igneous rock →
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Physical properties
Hardness: 6.5-7.5 (Garnet), Color: Orange to reddish-brown, Luster: Vitreous, Crystal structure: Isometric (dodecahedral or trapezohedral crystals common), Cleavage: None (conchoidal fracture), Specific gravity: 4.19
Formation & geological history
Forms primarily in granite pegmatites, allied rock types, and in certain low grade regional metamorphic phyllites.
Uses & applications
Often used as a gemstone when flawless and of good color. Also a collector's mineral.
Geological facts
Spessartine is the manganese aluminum garnet. It is named after Spessart in Bavaria, Germany, the type locality.
Field identification & locations
Identify by its distinctive orange color, isometric crystal habits, and lack of cleavage. Commonly found in pegmatite deposits worldwide, such as in Brazil, Madagascar, and the USA (California, Virginia).
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