mineral
Garnet (likely Almandine or Pyrope)
Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3
Hardness: 6.5-7.5. Color: Deep reddish-brown to pinkish-red. Luster: Vitreous to resinous. Crystal Structure: Isometric/Cubic. Cleavage: None (conchoidal fracture). Specific Gravity: 3.5-4.3.
- Hardness
- 6
- Color
- Deep reddish-brown to pinkish-red
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 6.5-7.5. Color: Deep reddish-brown to pinkish-red. Luster: Vitreous to resinous. Crystal Structure: Isometric/Cubic. Cleavage: None (conchoidal fracture). Specific Gravity: 3.5-4.3.
Formation & geological history
Formed under high temperatures and pressures in metamorphic rocks like schist and gneiss, or as accessory minerals in igneous rocks. Typically Neoproterozoic in East African regions.
Uses & applications
Used as an abrasive (sandpaper, waterjet cutting), in jewelry as a gemstone, and as an index mineral for determining metamorphic history.
Geological facts
Garnets have been used as gemstones since the Bronze Age. The name comes from 'granatus' (grain), likely referring to the pomegranate fruit. The location in southern Ethiopia/northern Kenya is part of the Mozambique Belt, famous for high-quality colored gemstones.
Field identification & locations
Identified by its high hardness, lacks cleavage, and characteristic deep red color. Look for 'dodecahedron' crystal shapes in the host rock. These rough specimens show typical alluvial or metamorphic shattering.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock