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A green to brown or black calcium-iron garnet, Ca3Fe2(SiO4)3.

[After José Bonifácio de Andrada e Silva.]


(Minerals) a yellow, green, or brownish-black garnet that consists of calcium iron silicate and is used as a gemstone. Formula: Ca3Fe2(SiO4)3
[C19: named after J. B. d'Andrada e Silva (1763–1838), Brazilian mineralogist; see -ite1]


(ˈæn drəˌdaɪt)

a garnet occurring in brown, green, or black crystals.
[1830–40; after J. B. de Andrada e Silva; see -ite1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.andradite - a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone
garnet - any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive
demantoid - a green andradite used as a gemstone
References in periodicals archive ?
On the basis of the type, the global garnet market is segmented into almandine, andradite, grossular, pyrope, spessartine, and uvarovite.
Rich collections of glassware--pieces of water-bottles, cups, wineglasses, flacons were found, and also jewelry including beads made of andradite and carnelian, glass, rings, and bronze bracelets.
Bill Larson,, Fallbrook, California, USA, for rough pieces of iridescent andradite from Mexico and a slab of jadeite from Russia.
Almandine, spessartine, grossular, uvarovite, andradite and pyrope are six minerals which are regarded as belonging to the garnet family.
From the XRD test, as shown in Figure 9, we can see that the hydration products such as hydrated calcium silicate, calcium aluminosilicate, and hydrated andradite increase significantly during hydration, indicating that crystallization increases with curing age.
The most spectacular piece is a combination specimen of sphalerite, quartz, andradite and hedenbergite over 25 cm in diameter.
The following standards and were used: Al on sanidine, Ca on titanite, Cl on NaCl, Cr on chromite, F on topaz, Fe on andradite, K on orthoclase, Mg on olivine, Mn on spessartine, Na on albite, Nb on columbite, Si on titanite, Ti on titanite and Zn on gahnite.
Demantoid garnet is a rare and beautiful bright grass green sub-variety of andradite garnet.Tsavolite, is a bright green variety of grossular garnet, its colour being induced by the presence of chromium.
The main finding was that the group of compounds [Ca.sub.3][Al.sub.2][Si.sub.3][O.sub.12] (andradite), [Ca.sub.3][Fe.sub.2][Si.sub.3][O.sub.12] (grossularite), [Ca.sub.3][Al.sub.3][H.sub.12][O.sub.12] and [Ca.sub.3][Fe.sub.2][H.sub.12][O.sub.12] form a complete series of solid solutions, with a garnet structure.
Epidote, chrolite, andradite and apatite have also been identified.
[37] studied the grossular-andradite solid solution using high pressure X-ray diffraction and showed the bulk modulus of grossular-andradite solid solution decreases with the increasing andradite content.