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Garnet Structural Group

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Formula:
X
 
3
Z
 
2
(TO
 
4
)
 
3
X = Ca, Fe, etc., Z = Al, Cr, etc., T = Si, As, V, etc.
System:Isometric
Name:Named from granatum (a pomegranate) for its resemblance to seeds of this fruit.


A group of cubic and pseudocubic nesosilicates, arsenates, vanadates and members with TO4 groups where T = Al, Fe3+, Te.
Found in many rock types.

Classification of Garnet Structural Group

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Crystallography of Garnet Structural Group

Crystal System:Isometric
Crystal Atlas:
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Garnet no.1 - Goldschmidt (1913-1926)
Garnet no.2 - Goldschmidt (1913-1926)
Garnet no.3 - Goldschmidt (1913-1926)
Garnet no.55 - Goldschmidt (1913-1926)
Garnet no.84 - Goldschmidt (1913-1926)

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Optical Data of Garnet Structural Group

Type:Isotropic

Chemical Properties of Garnet Structural Group

Formula:
X
 
3
Z
 
2
(TO
 
4
)
 
3


X = Ca, Fe, etc., Z = Al, Cr, etc., T = Si, As, V, etc.
Simplified for copy/paste:X3Z2(TO4)3

Relationship of Garnet Structural Group to other Species

Group Members:
Almandine 
Fe
2+
3
Al
 
2
(SiO
 
4
)
 
3
Andradite 
Ca
 
3
Fe
3+
2
(SiO
 
4
)
 
3
Berzeliite 
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
Bitikleite 
Ca
 
3
SbSn(AlO
 
4
)
 
3
Blythite 
Mn
2+
3
Mn
3+
2
[SiO
 
4
]
 
3
Calderite 
(Mn
2+
 
,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(SiO
 
4
)
 
3
Dzhuluite 
Ca
 
3
SbSnFe
3+
3
O
 
12
Elbrusite 
Ca
 
3
U
6+
 
ZrFe
3+
2
Fe
2+
 
O
 
12
Goldmanite 
Ca
 
3
V
3+
2
(SiO
 
4
)
 
3
Grossular 
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3
Henritermierite 
Ca
 
3
(Mn
3+
 
,Al)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
Hutcheonite 
Ca
 
3
Ti
 
2
(SiAl
 
2
)O
 
12
Irinarassite 
Ca
 
3
Sn
 
2
Al
 
2
SiO
 
12
Katoite 
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3-x
(OH)
 
4x
Kerimasite 
Ca
 
3
Zr
 
2
(SiO
 
4
)(Fe
3+
 
O
 
4
)
 
2
Khoharite 
Mg
 
3
Fe
3+
2
(SiO
 
4
)
 
3
Kimzeyite 
Ca
 
3
(Zr,Ti)
 
2
((Si,Al,Fe
3+
 
)O
 
4
)
 
3
Knorringite 
Mg
 
3
Cr
 
2
(SiO
 
4
)
 
3
Majorite 
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
(SiO
 
4
)
 
3
Menzerite-(Y) 
{(Y,REE),(Ca,Fe
2+
 
)}
 
3
{(Mg,Fe
2+
 
),(Fe
3+
 
,Al)}
 
2
[SiO
 
4
]
 
3
Momoiite 
(Mn
2+
 
,Ca)
 
3
V
3+
2
(SiO
 
4
)
 
3
Morimotoite 
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
Palenzonaite 
(Ca,Na)
 
3
CaMn
2+
2
(VO
 
4
)
 
3
Pyrope 
Mg
 
3
Al
 
2
(SiO
 
4
)
 
3
Schäferite 
Ca
 
2
NaMg
 
2
(VO
 
4
)
 
3
Schorlomite 
Ca
 
3
(Ti,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
Skiagite 
Fe
2+
3
Fe
3+
2
[SiO
 
4
]
 
3
Spessartine 
Mn
2+
3
Al
 
2
(SiO
 
4
)
 
3
Toturite 
Ca
 
3
Sn
 
2
(SiO
 
4
)(Fe
3+
 
O
 
4
)
 
2
Usturite 
Ca
 
3
SbZr(Fe
3+
 
O
 
4
)
 
3
Uvarovite 
Ca
 
3
Cr
 
2
(SiO
 
4
)
 
3
Yafsoanite 
Ca
 
3
Zn
 
3
(TeO
 
6
)
 
2
Minerals chemically related to group:
Cryolithionite
Na
 
3
Li
 
3
[AlF
 
6
]
 
2

Other Names for Garnet Structural Group

Synonyms:
Garamantious
Other Languages:
Basque:Granate
Bulgarian:Гранат
Catalan:Granat
Croatian:Granati
Czech:Granát
Danish:Granat
Dutch:Granaat
Esperanto:Grenato
Estonian:Granaadid
Finnish:Granaatti
French:Grenat
Georgian:გრანატები
German:Granatgruppe
Eisensteinflöße
Granat
Hebrew:גארנט
Italian:Granato
Japanese:柘榴石
Lithuanian:Granatas
Persian:لعل
Polish:Granat
Portuguese:Granada
Romanian:Granat
Russian:Гранат
Slovak:Skupina granátu
Spanish:Granates
Swedish:Granater
Ukrainian:Гранати

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Garnet Structural Group

Reference List:

- +
Hutton, Colin Osborne (1962), Composition of some garnets in low-grade schists Royal Society of New Zealand Geology 1: 129-133.

McConnell, D. (1964): Refringence of garnets and hydrogarnets. Canadian Mineralogist 8, 11-22

Evans, B.W. (1965), Microprobe study of zoning in eclogite garnets: Geol. Soc. Amer. Abstract with Program: 54.

Sobolev, N.V., Jr., Kuznetsova, I.K., and Zyuzin, N.I. (1968) The petrology of grospydite xenoliths from the Zagadochnaya Kimberlite pipe in Yakutia. Journal of Petrology: 9: 253-280.

Dudley, P.P. (1969), Electron microprobe analyses of garnets in glaucophane schists and associated eclogites: American Mineralogist: 54: 1139-1150.

Sawatzky, G.A., Van Der Woude, F., and Morrish, A.H. (1969) Recoilness-fraction ratio for 57Fe in octahedral and tetrahedral sites of a spinel and a garnet. Physical Reviews: 183(2): 383-386.

Reid, A.M., Brown, R.W., DAwson, J.B., Whitfield, G.G., and Siebert, J.C. (1976) Garnet and pyroxene compositions in some diamondiferous eclogites. Contributions to Mineralogy and Petrology: 58: 203-220.

Green, T.H. (1977) Garnet in silicic liquids and its possible use as a P-T indicator. Contributions to Mineralogy and Petrology: 65: 59-67.

Kolesnik, Y.N., Nogteva, V.V., and Paukov, I.Y. (1977) The specific heat of pyrope at 13 to 300 K and the thermodynamic parameters of some natural varieties of garnet. Geochemistry International 1977: 126-133.

Newton, R.C., Charlu, T.V., and Kleppa, O.J. (1977) Thermochemistry of high pressure garnets and clinopyroxenes in the system CaO-MgO-Al2O3-SiO2. Geochimica et Cosmochimica Acta: 41: 369-377.

Schwartz, K.B., Nolet, D.A., and Burns, R.G. (1980) Mössbauer spectroscopy and crystal chemistry of natural Fe-Ti garnets. American Mineralogist: 65: 142-153.

Smith, B.K. (1982), Plastic deformation of garnets; mechanical behavior and associated microstructures, 208 p. University of California, Berkeley, Berkeley, California.

Cecchini A., Franzini M., Troysi M.(1988): Nuovi dati sulla microdurezza dei granati. Atti Soc.Tosc.Sc.Nat., Mem., Serie A, 95, 21-28.

Bell, D.R., Ihinger, P.D., and Rossman, G.R. (1995) Quantitative analysis of trace OH in garnet and pyroxenes. American Mineralogist: 80: 465-474.

Mukhopadhyay, B., Holdaway, M.J., and Koziol, A.M. (1997) A statistical model of the thermodynamic mixing properties of Ca-Mg-Fe2+ garnets. American Mineralogist: 82: 165-181.

Nakano, T. and Ishikawa, Y. (1997) Chemical zoning of pegmatite garnets from the Ishikawa and Yamonoo areas, northeastern Japan. Geochem. Journal: 31: 105-118.

Kolesov, B.A. and Geiger, C.A. (1998) Raman spectra of silicate garnets. Physics and Chemistry of Minerals: 25: 142-151.

Voegele, V., J.I. Ando, P. Cordier, & R.C. Liebermann (1998a), Plastic deformation of silicate garnets; , High-pressure experiments. Physics of the Earth and Planetary Interiors: 108: 305-318.

Voegele, V., P. Cordier, V. Sautter, T.G. Sharp, J.M. Lardeaux, & F.O. Marques (1998b), Plastic deformation of silicate garnets; II, Deformation microstructures in natural samples. Physics of the Earth and Planetary Interiors: 108: 319-338.

Bofa Ballaran, T., Carpenter, M.A., Geiger, C.A., and Kozol, A. (1999) Local structural heterogeneity in garnet solid solutions. Physics and Chemistry of Minerals: 26: 554-569.

Wang, L., E.J. Essene, & . Zhang (1999a), Mineral inclusions in pyrope crystals from Garnet Ridge, Arizona, USA; implications for processes in the upper mantle: Contributions to Mineralogy and Petrology: 135: 164-178.

Wang, Z., S. Ji, T.E. Rivers, D.R.M.E. Pattison, & R.F.E. Martin (1999b), Defromations of silicate garnets; brittle-ductile transition and its geological implications, Mineral-scale processes in metamorphic petrology; the Kretz volume.The Canadian Mineralogist: 37(2): 525-541.

Arredondo, E.H. and Rossman, G.R. (2002) Feasibility of determining the quantitative OH content of garnets with Raman spectroscopy. American Mineralogist: 87: 307-311.

Wang, L., Essene, E.J., and Zhang, Y. (2000) Direct observation of immiscibility in pyrope-almandine-grossular garnet. American Mineralogist: 85: 41-46.

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    Localities for Garnet Structural Group

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