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  1. Index
  2. Fluorescent Minerals (UV)
  3. Garnet

Fluorescent Minerals (UV) "Garnet"

Garnets are a group of minerals.
The main representatives of the garnet series:

        Pyrope Mg3Al2[SiO4]3 — Dark red color. It is found in ultramafic rocks rich in magnesium and their degradation products. Characteristic for diamond-bearing rocks of South Africa and Yakutia.
       Almandine Fe2+3Al2[SiO4]3 — Color red, brown, violet. The most common of the pomegranates. Common in crystalline schists and gneisses.
         Spessartine Mn3Al2[SiO4]3 — Color pink, red, yellowish-brown. It occurs in pegmatites and crystalline schists.
         Grossular Ca3Al2[SiO4]3 — Color light green (tsavorite) or greenish-brown. Characteristic of skarns.
        Andradite Ca3Fe3+2[SiO4]3 — Color yellow (topazolite), brown, red, greenish-brown. It is also found in skarns, less often in shales and other rocks.
         Demantoid - a transparent variety of green andradite (1.5% Cr2O3) is a precious stone.
         Melanite is black in color and contains TiO2.
         Uvarovite Ca3Cr2[SiO4]3 — Emerald green color. Forms finely crystalline crusts in chromite. Rare.

Изоморфные ряды граната наглядно

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Physical properties of Garnet

General
Category Nesosilicate
Formula
(repeating unit)		 The general formula X3Y2(SiO4)3
IMA symbol Grt
Crystal system Isometric
Crystal class {displaystyle 4/m{ar {3}}2/m}
Space group Ia3d
Identification
Color virtually all colors, blue is very rare
Crystal habit Rhombic dodecahedron or cubic
Cleavage Indistinct
Fracture conchoidal to uneven
Mohs scale hardness 6.5–7.5
Luster vitreous to resinous
Streak White
Specific gravity 3.1–4.3
Polish luster vitreous to subadamantine
Optical properties Single refractive, often anomalous double refractive
Refractive index 1.72–1.94
Birefringence None
Pleochroism None
Ultraviolet fluorescence variable
Other characteristics variable magnetic attraction
Major varieties
Pyrope Mg3Al2Si3O12
Almandine Fe3Al2Si3O12
Spessartine Mn3Al2Si3O12
Andradite Ca3Fe2Si3O12
Grossular Ca3Al2Si3O12
Uvarovite Ca3Cr2Si3O12

Corundum (UV), Almandine garnet (sphere)
Code: 3604
Corundum (UV), Almandine garnet (sphere)
Hit Island, Karelia, RF
52mm

0.00 $ $130.00

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