spessartite

spessartite

[spes-er-tahyt]
noun
Mineralogy. a yellow or red manganese-aluminum garnet, used as a semiprecious gem.
Also called spessartine [spes-er-teen, -tin] .


Origin:
1885–90; named after Spessart, a district in Bavaria, where it is found; see -ite1

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World English Dictionary
spessartite or spessartine (ˈspɛsəˌtaɪt)
 
n
a brownish red garnet that consists of manganese aluminium silicate and is used as a gemstone. Formula: Mn3Al2(SiO4)3
 
[C19: named after Spessart, mountain range in Germany]
 
spessartine or spessartine
 
n
 
[C19: named after Spessart, mountain range in Germany]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

spessartite

manganese aluminum garnet that is a semiprecious gem when clear. Found combined with almandine, it ranges in colour from pale orange yellow, when nearly pure, to orange or deep red, when appreciable proportions of almandine are present. It is similar in colour to grossular, but, unlike that species, it is commonly transparent. Spessartine is rare and, therefore, seldom used in jewelry. It is ordinarily found in granite, felsic lavas, pegmatite veins, and metamorphic rocks, as in central India, Madagascar, and Silver Cliff, Colo., U.S. For details of chemistry and occurrence, see garnet.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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