Malaia garnet

Gemological varietal name for certain colors of garnet
(repeating unit)(Mg,Mn)3Al2(SiO4)3 [1]Crystal systemcubic [1]IdentificationColorlight to dark slightly pinkish orange, reddish orange, yellowish orangeCleavagenone, may show indistinct parting [1]Fractureconchoidal [1]Mohs scale hardness7 - 7.5 [1]Lustervitreous [1]DiaphaneitytransparentSpecific gravity3.78 - 3.85 [1]Polish lustervitreous to subadamantine[1]Optical propertiesSingle refractive, often anomalous double refractive [1]Refractive index1.760 (+.020, -.018) [1]Birefringencenone [1]Pleochroismnone [1]Ultraviolet fluorescenceinert [1]Absorption spectrastrong lines at 410, 420, 430nm, that may merge to form cutoff below 435nm. Also some combination of lines at 460, 480, 504, 520, or 573nm.[1]

Malaia garnet or Malaya garnet is a gemological varietal name for light to dark slightly pinkish orange, reddish orange, or yellowish orange garnet, that are of a mixture within the pyralspite series pyrope, almandine, and spessartine with a little calcium. The name Malaia is translated from Swahili to mean, prostitute. It is found in east Africa, in the Umba Valley bordering Tanzania and Kenya.[2]

References

  1. ^ a b c d e f g h i j k l m n (Gia), Gemological. Gem Reference Guide. City: Gemological Institute of America (GIA), 1988. ISBN 0-87311-019-6
  2. ^ Garnet(Almandine, Rhodolite, Pyrope, Demantoid, Tsavorite, Hessonite, Grossular, Spessartine) Course notes at the Department of Geological Sciences, The University of Texas at Austin website, accessed January 27, 2007
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