metamorphic
Garnet in Host Rock
Garnet Group (A3B2(SiO4)3)
Hardness: 6.5-7.5 (Mohs scale); Color: Deep reddish-brown to orange-red; Luster: Vitreous to resinous; Crystal Structure: Isometric (dodecahedral habits); Cleavage: None/Indistinct; Specific Gravity: 3.5-4.3
- Hardness
- 6
- Color
- Deep reddish-brown to orange-red
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 6.5-7.5 (Mohs scale); Color: Deep reddish-brown to orange-red; Luster: Vitreous to resinous; Crystal Structure: Isometric (dodecahedral habits); Cleavage: None/Indistinct; Specific Gravity: 3.5-4.3
Formation & geological history
Formed during regional or contact metamorphism of sedimentary or igneous rocks under high pressure and temperature. Commonly found in mica schists or gneisses of various geological ages.
Uses & applications
Used as an abrasive in industrial sandblasting and waterjet cutting; high-grade specimens are faceted into gemstones for jewelry.
Geological facts
Garnet is actually a group of minerals with similar crystal structures but different chemical compositions, such as Almandine, Pyrope, and Spessartine. It represents the birthstone for January.
Field identification & locations
Identify in the field by its distinct dodecahedral crystal shape, lack of cleavage, and deep red wine-like color. Common in metamorphic belts such as the Adirondacks or Appalachian Mountains.
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