Mineral 1.0: Garnet

Mineral 1.0

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Little dark red garnets in schist

Mineral Picture courtesy of www.yuprocks.com

Garnet  (Pyrope, Grossular, Almandine)(Mg,Fe,Ca)₃Al₂(SiO₄)₃

Class: Silicate
Hardness: 6.5 - 7
Density: 3.8
Streak: White
Lustre: Vitreous
Habit: Small, well-formed crystals
Colours: Darker reddy colours
   Crystal System: Isometric
Cleavage: None
Fracture: Conchoidal
Magnetism: None
Reaction with HCl: None
Identification in hand sample:
Crystal habit, colour and hardness.
Industrial / ecomonic uses:
Abrasives (particularly sandpaper), semi-precious gemstone.
Comments:
Valuable for determining the time-temperature-pressure history of a rock due to chemical zoning under different P and T conditions.



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