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Glittering
Stones >> Semi
precious stones >> Garnet
Semi Precious Stone Garnet
The garnet group of minerals usually shows crystals
with a habit of rhombic dodecahedrons and also with trapezohedrons.
They are nesosilicates with the same general formula, A3B2 (SiO4)3.
The chemical elements in the garnet include calcium, magnesium,
aluminum, iron2+, iron3+, chromium, manganese, and also titanium.
Garnets show no cleavage and a dodecahedral parting. Fracture
is a concordat to uneven; some varieties are very tough and are
also very valuable for abrasive purposes. Hardness is 6.5 - 8.5,
specific gravity is 3.1 - 4.3, luster is vitreous to resinous,
and that they can be transparent to opaque.
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Historical Facts of Garnet
| Refractive Index |
1.72 - 1.94 |
| Crystal System |
Cubic |
| Chemical Composition |
X3Y2(SiO4)3 |
| Mohs Scale Hardness |
6.0 - 7.5 |
| Major Varieties |
Almandine, Pyrope, Spessartite, Andradite, Grossular,
Uvarovite |
| Colors |
Red, orange, yellow, green, blue, purple, brown, black,
pink and colorless |
| Occurrence |
Macon County, North Carolina, United States, Russia,
Turkey |
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Gem Jewelry Garnet
| Garnet Bracelet |
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| Garnet Earrings |
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| Garnet Necklace |
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| Garnet Rings |
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