The garnets constitute a group of minerals which share a
common structure. Common end member compositions are:
-
Almandine ---------- Fe2+3Al2(SiO4)3
-
Andradite ----------- Ca3Fe3+2(SiO4)3
-
Grossular ----------- Ca3Al2(SiO4)3
-
Pyrope -------------- Mg3Al2(SiO4)3
-
Spessartite ---------- Mn3Al2(SiO4)3
-
Uvarovite ----------- Ca3Cr2(SiO4)3
Other, less common end-member compositions are:
-
Calderite ------------ Mn3Fe3+2(SiO4)3
-
Goldmanite --------- Ca3V2(SiO4)3
-
Hibschite ------------ Ca3Al2(SiO4)3-x(OH)4x
0.2 < x < 1.5
-
Katoite -------------- Ca3Al2(SiO4)3-x(OH)4x
x > 1.5
-
Kimzeyite ----------- Ca3(Zr,Ti)2((Si,Al,Fe3+)O4)3
-
Knorringite ---------- Mg3Cr2(SiO4)3
-
Majorite ------------- Mg3(Fe,Al,Si)2(SiO4)3
-
Morimotoite -------- Ca3Ti4+Fe2+(SiO4)3
-
Schorlomite --------- Ca3Ti4+2((Fe3+2Si)O4)3
Infrared Spectra (generally 4000 - 3000 cm-1)
Images of OH in garnets
-
GRR 991 image A low OH content pyrope,
Williams diatreme, Montana data file
-
GRR 1721 image Pyrope, Hanaus Farm,
Namibia data file
-
GRR 771 image. Grossular, Tanzania;
0.5 mm thick. Ref: Rossman and Aines (1991) American Mineralogist 76, 1153-1164.
data file, 36K
-
GRR 1358 image. Hydrogrossular,
Commercial Quarry, Crestmore, California; 0.025 mm thick. Ref: Rossman
and Aines (1991) American Mineralogist 76, 1153-1164. data
file, 7K
-
GRR 1765 image Andradite (variety
yellowish-green demantoid), locality unknown, but probably Russia data
file
-
GRR 62952 image Andradite (variety
bright green demantoid), Russia. data file
Data Files
-
GRR 981, data file, Pyrope, Big Slide diatreme,
MT
-
GRR 982, data file, Pyrope, Big Slide diatreme,
MT
-
GRR 986, data file, Pyrope, Williams Kimberlite, MT
-
GRR 994, data file, Pyrope, Williams Kimberlite, MT
-
GRR 1682 data file, Pyrope, Coromandel, Minas Gerais,
Brazil
-
GRR 1714 data file, Pyrope, Dohghai, Jiangsu Prov.,
China
-
GRR 1722, data file, Pyrope, Thailand
-
GRR 1723, data file , Pyrope, alkali basalt, Nigeria
Back to the list of minerals
Back to the Mineral Spectroscopy home page
