Andradite is a species of the garnet group.It is a nesosilicate, with formula Ca 3 Fe 2 Si 3 O 12.. Andradite includes three varieties: Melanite: Black in color, referred to as "titanian andradite".; Demantoid: Vivid green in color, one of the most valuable and rare stones in the gemological world.; Topazolite: Yellow-green in color and sometimes of high enough quality to be cut into a faceted ...
Andradite is a member of the Garnet group, and although not as well-known as other Garnets such as Almandine or Pyrope, it is still fairly abundant and can produce fine Garnet gemstones.A valuable gem form of Andradite is the rare Demantoid, which is a transparent green variety that is highly lustrous with an adamantine luster.Andradite is named in honor of José Bonifácio de Andrada e Silva ...
General Andradite Information : Chemical Formula: Ca3Fe+++2(SiO4)3 : Composition: Molecular Weight = 508.18 gm Calcium 21.01 % Ca 33.11 % CaO: Iron 19.52 % Fe 31.42 % Fe 2 O 3: Silicon 14.73 % Si 35.47 % SiO 2: Oxygen 44.74 % O: 100.00 % 100.00 % = TOTAL OXIDE
Named in 1868 by James Dwight Dana in honor of José Bonifácio de Andrada e Silva [June 13, 1763 Santos, Brazil - April 6, 1838 Niterói, Brazil], Brazilian mineralogist, who first described and named what Dana (1868) defined as a subvariety of andradite. d'Andrada had earlier, in 1800, discovered a yellowish-grey mineral from a mine (Wirum?) near Drammen, Buskerud, Norway.
Garnet Goddess Crystals. All Garnets honor Sekhmet, the Egyptian Goddess of War. She is the most powerful goddess of Lower Egypt, and is usually depicted with the head of a lion and the body of a beautiful woman.
Andradite Properties Andradite is a calcium iron silicate, characterized by its beautiful and elemental colors of olive, black, and dark yellow. There are different kinds of Andradite, which include Demantoid, Melanite, and Topazolite. Demantoids are the green and
Demantoid garnet, the chromium-bearing, green variety of andradite, is the most well-known and valuable andradite. For more information on value and quality factors for this gem, consult our demantoid buying guide.
Andradite definition is - a calcium-iron garnet occurring in various colors ranging from yellow and green to brown and black.
Andradite is the most is the most lustrous of the Garnets and has several gemstone varieties. The term Garnet describes a group name for several closely related minerals that form important gemstones, and Andradite is an individual member mineral of the Garnet group.
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