| Garnet Group |
Name |
Composition |
Colour |
Inclusion |
Locality |
Aluminium
Group
Pyralspite series |
Pyrope Garnet
|
Mg3Al2 (SiO4)3
Magnesium Aluminium Silicate |
Red, purplish-
red (iron or chromium cause colour) |
Needle-like crystal.
Often free
from
inclusions |
South Africa
Sri Lanka
USA |
Rhodolite
|
(Mg,Fe)3Al2(SiO4)3 |
Purplish-
red (iron or chromium cause colour) |
Needle-like crystal.
Often free
from
inclusions |
South Africa
Sri Lanka
USA |
Alamandine Garnet
|
Fe3Al2(SiO4)3
Iron Aluminium Silicate |
Brownish to purplish-red,
pale to deep mauve. (4 or 6-rayed stars.) |
Stress cracks (zircon
hales),
needle-like rutiles are characteristic
inclusions.
(4 or 6-rayed
stars.)
|
Brazil
India
Sri Lanka |
Spessartine Garnet
Spessartite
|
Mn3Al2(SiO4)3
Manganese Aluminium Silicate |
Yellowish-
orange, red, brownish-red. |
|
Brazil
Myanmar
Sri Lanka |
Calcium Group
Ugrandite series
Grossular Garnet
Grossularite |
|
Ca3Al2(SiO4)3
Calcium Aluminium Silicate |
Brownish-
yellow to brownish-red, orange |
|
|
Hessonite
Cinnamon stone
Kaneel stone
|
|
Brownish-
yellow to brownish-red, orange |
A granular internal appearance is caused
by the progusion of rounded crystals
(they may be apatite, calcite or zircon) |
Sri Lanka
Brazil
India
Canada
Madagascar
Tanzania
USA |
Green grossular
Tsavorite
Tsavolite
|
|
Bright bluish-green to yellowish-
green. Vanadium
& chromium are the probable
cause of the colour. |
|
Kenya
Madagascar
Tanzania |
| Leuco Garnet |
|
Clourless
variety |
|
Canada
Mexico
Tanzania |
Hydrogrossular
|
|
Opaque greenish variety |
|
South Africa
Burma
Zambia |
Calcium Group
Andradite Garnet |
|
Ca3Fe2(SiO4)3
Calcium Iron Silicate |
|
|
|
Demantoid
|
|
Green and
yellow-green. Chromium is colouring
element. |
Radiating aggregates
of a fibrous mineral - horsetail inclusion. Russian demantoid |
Russia
Namibia |
Melanite
|
|
Opaque black variety |
|
Germany
France
Italy
Colorado |
| Topazolite |
|
Yellow to
lemon yellow, topaz-like variety. |
|
Switzerland
Italy
California |
Uvarovite
|
|
Ca3Cr2(SiOr)3
Calcium chromium silicate |
Emerald-green |
|
Finland
India
Canada
Poland
Russia
California |
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