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Spessartine

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Spessartine
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Spessartine (the yellow mineral)
General
Category Mineral
Chemical formula Mn3Al2(SiO4)3
Identification
Color yellowish orange to reddish orange [1]
Crystal system cubic [1]
Cleavage none
Fracture conchoidal [1]
Mohs scale hardness 7 - 7.5 [1]
Luster vitreous
Specific gravity 4.15 (+.05, -.03)[1]
Polish luster vitreous to subadamantine [1]
Optical properties Single refractive, often anomalous double refractive [1]
Refractive index 1.810 (+.004, -.020)
Birefringence none
Pleochroism none
Dispersion .027 [1]
Ultraviolet fluorescence inert [1]
Absorption spectra bands 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]

Spessartine previously named spessartite, is a nesosilicate, manganese aluminium garnet, Mn3Al2(SiO4)3.[1] 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 phyllites. The major sources for gem quality spessartine are Sri Lanka and Brazil. Other sources include Australia, Burma, India, Israel, Madagascar and the US.[1] Spessartine of a orange-yellow is found in Madagascar (see Mandarin garnet). Violet-red spessartites are found in rhyolites in Colorado and Maine.

Archivo:Granat sesspartyn, Chiny.JPG

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ReferencesEditar

  1. 1,00 1,01 1,02 1,03 1,04 1,05 1,06 1,07 1,08 1,09 1,10 1,11 Gemological Institute of America, GIA Gem Reference Guide 1995, ISBN:0-87311-019-6
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hu:Spessartin nl:Spessartien zh:锰铝榴石

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