metamorphic
Garnet in Matrix (Schist or Quartz)
Almandine Garnet, Fe3Al2(SiO4)3
Hardness: 6.5-7.5 (garnets), 7 (quartz). Color: Deep brownish-red crystals in a white/grey matrix. Luster: Vitreous to resinous. Crystal structure: Isometric (dodecahedron). Cleavage: None. Specific Gravity: 3.5-4.3.
- Hardness
- 6
- Color
- Deep brownish-red crystals in a white/grey matrix
- Luster
- Vitreous to resinous
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7.5 (garnets), 7 (quartz). Color: Deep brownish-red crystals in a white/grey matrix. Luster: Vitreous to resinous. Crystal structure: Isometric (dodecahedron). Cleavage: None. Specific Gravity: 3.5-4.3.
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rocks (shales) under high pressure and temperature. Commonly found in metamorphic belts worldwide.
Uses & applications
Industrial abrasives (sandblasting, waterjet cutting), gemstones for jewelry, and as a popular mineral specimen for collectors.
Geological facts
Garnet is the birthstone for January. Almandine is the most common member of the garnet group and has been used since ancient times as a gemstone and abrasive.
Field identification & locations
Identify by the presence of dark red, dodecahedral crystals embedded in a lighter matrix. Look for high hardness and lack of cleavage in the red crystals. Common in mica schists or quartz veins.
More like this
