| GEOBITS
of Garnets: |
 |
Some
of these rare garnets are, so far, extremely
rare: Majorite has only been found in meteorites, and
several others have been found in just a very few locations
-
|
|
| Common
End-Member Garnet Species |
| Species |
Chemical Formula |
Color |
| Almandine |
Fe3Al2(SiO4)3
|
Red, brown-red, purple-red |
| Pyrope |
Mg3Al2(SiO4)3
|
Red, purple |
| Spessartine |
Mn3Al2(SiO4)3 |
Orange, red-orange, red-brown |
| Grossular |
Ca3Al2(SiO4)3 |
White, orange, brown, green |
| Andradite |
Ca3Fe2(SiO4)3 |
Yellow, green, brown, black |
| Uvarovite |
Ca3Cr2(SiO4)3
|
Deep green |
|
| |
| Rare
End-Member Garnet Species |
| Species |
Chemical Formula |
Color |
| Calderite |
(Mn2+,Ca)3 (Fe3+Al)2(SiO4)3 |
Dark yellow to yellow-brown or reddish brown |
| Goldmanite |
Ca3(V,Al,Fe3+)2(SiO4)3 |
Dark green to brownish green or grass green |
| Hibschite |
Ca3,Al2(SiO4)3-x(OH)4x |
Colorless, white, gray, green, bluish green, pink |
| Katoite |
Ca3 Al2(SiO4) 3-x(OH)4x |
Colorless or milky white |
| Kimzeyite |
Ca3(Zr,Ti)2(Si,Al,Fe3+)3O12 |
Brown |
| Knorringite |
Mg3Cr2(Si04)3 |
Blue-green to lilac, dark green |
| Majorite |
Mg3(Fe,Al,Si)2(SiO4)3 |
when synthetic Purple-violet,
colorless, or yellowish-brown |
| Morimotite |
Ca3T1Fe2+Si3O12 |
Black |
| Schorlornite |
Ca3Ti4+2(Fe3+2Si)O12 |
Black to very dark brown |
|
|
| This
issue of Geobits was contributed by Dr. L.S. CHAN |
