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{{Infobox mineral
{{Infobox mineral
| name = Spessartine
| name =
| category =
| category =
| boxwidth =
| boxwidth =
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| image = Espessartita.jpeg
| image = Espessartita.jpeg
| imagesize = 200px
| imagesize = 200px
| caption = Spessartine (the yellow mineral)
| caption = (the yellow mineral)
| formula = Mn<sub>3</sub>Al<sub>2</sub>(SiO<sub>4</sub>)<sub>3</sub>
| formula = Mn<sub>3</sub>Al<sub>2</sub>(SiO<sub>4</sub>)<sub>3</sub>
| molweight =
| molweight =
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| mohs = 7 - 7.5 <ref name="GRG"/>
| mohs = 7 - 7.5 <ref name="GRG"/>
| luster = vitreous
| luster = vitreous
| polish = vitreous to subadamantine <ref name="GRG"/>
| polish = vitreous to <ref name="GRG"/>
| refractive = 1.810 (+.004, -.020)
| refractive = 1.810 (+.004, -.020)
| opticalprop = Single refractive, often anomalous double refractive <ref name="GRG"/>
| opticalprop = Single refractive, often anomalous double refractive <ref name="GRG"/>
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| other =
| other =
}}
}}
'''Spessartine''' previously named '''spessartite''', is a [[nesosilicate]], [[manganese]] [[aluminium]] [[garnet]], [[manganese|Mn]]<sub>3</sub>[[aluminum|Al]]<sub>2</sub>([[silicon|Si]][[oxygen|O]]<sub>4</sub>)<sub>3</sub>.<ref name="GRG">[[Gemological Institute of America]], ''GIA Gem Reference Guide'' 1995, ISBN:0-87311-019-6</ref>
'''''' '''''', is a [[nesosilicate]], [[manganese]] [[aluminium]] [[garnet]], [[manganese|Mn]]<sub>3</sub>[[aluminum|Al]]<sub>2</sub>([[silicon|Si]][[oxygen|O]]<sub>4</sub>)<sub>3</sub>.<ref name="GRG">[[Gemological Institute of America]], ''GIA Gem Reference Guide'' 1995, ISBN:0-87311-019-6</ref>
The names is a derivative of [[Spessart]] in [[Bavaria]]. It occurs most often in [[granite]] [[pegmatite]] and allied rock types and in certain low grade [[metamorphic]] [[phyllite]]s. The major sources for gem quality spessartine are [[Sri Lanka]] and [[Brazil]]. Other sources include [[Australia]], [[Burma]], [[India]], [[Israel]], [[Madagascar]], [[Tanzania]] (since late 2007) and the [[US]].<ref name="GRG"/> Spessartine of a [[orange (color)|orange]]-yellow is found in [[Madagascar]] (see [[Mandarin garnet]]). Violet-red spessartites are found in [[rhyolite]]s in [[Colorado]] and [[Maine]].
The is a derivative of [[Spessart]] in [[Bavaria]]. It occurs most often in [[granite]] [[pegmatite]] and allied rock types and in certain low grade [[metamorphic]] [[phyllite]]s. The major sources for gem quality are [[Sri Lanka]] and [[Brazil]]. Other sources include [[Australia]], [[Burma]], [[India]], [[Israel]], [[Madagascar]], [[Tanzania]] (since late 2007) and the [[US]].<ref name="GRG"/> of a [[orange (color)|orange]]-yellow is found in [[Madagascar]] (see [[Mandarin garnet]]). Violet-red spessartites are found in [[rhyolite]]s in [[Colorado]] and [[Maine]].
[[Image:Granat sesspartyn, Chiny.JPG|thumb|left|180px|Spessartine]]
[[Image:Granat sesspartyn, Chiny.JPG|thumb|left|180px|]]


==External links==
==External links==
* [http://www.mindat.org/min-3725.html Mindat page about spessartine]
* [http://www.mindat.org/min-3725.html Mindat page about ]
* [http://webmineral.com/data/Spessartine.shtml Webmineral page about spessartine]
* [http://webmineral.com/data/Spessartine.shtml Webmineral page about ]


==References==
==References==

Revision as of 03:12, 6 June 2009

Spessartite
Spessartite (the yellow mineral)
General
CategoryMineral
Formula
(repeating unit)		Mn3Al2(SiO4)3
Crystal systemcubic [1]
Identification
Coloryellowish orange to reddish orange [1]
Cleavagenone
Fractureconchoidal [1]
Mohs scale hardness7 - 7.5 [1]
Lustervitreous
Specific gravity4.15 (+.05, -.03)[1]
Polish lustervitreous to subadamantite [1]
Optical propertiesSingle refractive, often anomalous double refractive [1]
Refractive index1.810 (+.004, -.020)
Birefringencenone
Pleochroismnone
Dispersion.027 [1]
Ultraviolet fluorescenceinert [1]
Absorption spectrabands at 410, 420, 430nm (or merging to form cutoff below 430nm; also bands at 460, 480, 520nm. Possible weak bands at 504, or 573nm [1]

Spessartite, also known as spessartine, is a nesosilicate, manganese aluminium garnet, Mn3Al2(SiO4)3.[1] The name is a derivative of Spessart in Bavaria. It occurs most often in granite pegmatite and allied rock types and in certain low grade metamorphic phyllites. The major sources for gem quality spessartite are Sri Lanka and Brazil. Other sources include Australia, Burma, India, Israel, Madagascar, Tanzania (since late 2007) and the US.[1] Spessartite of a orange-yellow is found in Madagascar (see Mandarin garnet). Violet-red spessartites are found in rhyolites in Colorado and Maine.

Spessartite

References

  1. ^ a b c d e f g h i j k l Gemological Institute of America, GIA Gem Reference Guide 1995, ISBN:0-87311-019-6
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