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andradite

[an-druh-dahyt] /ˈæn drəˌdaɪt/
noun
1.
a mineral, calcium-iron garnet, Ca 3 Fe 2 Si 3 O 2 , occurring in brown, green, or black crystals.
Origin
1830-1840
1830-40; named after J. B. de Andrada e Silva; see -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for andradite
  • Garnet is iron-rich andradite and pyroxene is intermediate in composition.
British Dictionary definitions for andradite

andradite

/ˈændrəˌdaɪt/
noun
1.
a yellow, green, or brownish-black garnet that consists of calcium iron silicate and is used as a gemstone. Formula: Ca3Fe2(SiO4)3
Word Origin
C19: named after J. B. d'Andrada e Silva (1763–1838), Brazilian mineralogist; see -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for andradite

calcium-iron garnet, perhaps the most spectacular garnet because of its high dispersion (separation of light into colours), even greater than that of diamond, and refractive index. It is found in various colours, some of the most beautiful being yellowish (termed topazolite, because of its resemblance to topaz) and yellowish green or emerald-green (Uralian emeralds, or demantoid). Titanium may extensively replace both the iron and the silicon, as in schorlomite, or may simply produce a black colour, as in melanite. Andradite is typically found with grossular in contact-metamorphosed limestone. For details of chemistry and occurrence, see garnet.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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