mineral
Garnet (likely Almandine or Pyrope)
Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)
Hardness: 6.5–7.5 on Mohs scale; Color: Deep red to reddish-purple (wine-colored); Luster: Vitreous to sub-vitreous; Crystal structure: Cubic (isometric), often forming dodecahedrons; Cleavage: None (conchoidal fracture); Specific Gravity: 3.1–4.3
- Hardness
- 6
- Color
- Deep red to reddish-purple (wine-colored)
- Luster
- Vitreous to sub-vitreous
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Physical properties
Hardness: 6.5–7.5 on Mohs scale; Color: Deep red to reddish-purple (wine-colored); Luster: Vitreous to sub-vitreous; Crystal structure: Cubic (isometric), often forming dodecahedrons; Cleavage: None (conchoidal fracture); Specific Gravity: 3.1–4.3
Formation & geological history
Formed primarily in metamorphic rocks like schist and gneiss under high pressure and temperature, or in certain igneous rocks. Found in geological formations spanning from Precambrian to more recent eras.
Uses & applications
Extensively used in jewelry (January birthstone) due to its durability. Industrially, it is used as an abrasive in waterjet cutting, sandblasting, and filtration media.
Geological facts
Garnets have been used as gemstones since the Bronze Age and were popular in Ancient Roman jewelry. Some 'Bohemian garnets' are historically significant for their intense dark red color and were a Victorian fashion staple.
Field identification & locations
Identify by its characteristic deep red 'pomegranate' color, high hardness (cannot be scratched by steel), and lack of cleavage. Common locations include India, Madagascar, Sri Lanka, and the United States (New York/Arizona).
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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