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Green Uvarovite Garnet
PHYSICAL
PROPERTIES:
Chemistry: Ca3Cr2(SiO4)3
Composition: Calcium Chromium Silicate
Class: Silicates
Subclass: Nesosilicates
Group: Garnet
Crystal system: isometric
Fracture: conchoidal
Hardness: 6.5 - 7
Specific gravity: 3.8
Refractive Index: 1.86
Luster: vitreous
Streak: white
Cleavage: absent
Color: Green
Transparency: transparent to translucent
Associated Minerals: chromite and serpentine
DISTINGUISHING CHARACTERISTICS:
Uvarovite is the only consistently green garnet and
has a beautiful emerald-green color.
ENVIRONMENT:
As with the other calcium garnets (andradite and grossular), uvarovite
is formed from the metamorphism of impure siliceous limestones and some
other rocks that contain chromium.
CRYSTAL DESCRIPTION:
like other garnets, Uvarovite forms rounded crystals with
12 rhombic or 24 trapezoidal faces these habits include the typical rhombic
dodecahedron. But more commonly found as the 24 sided trapezohedron. Massive
and granular occurrences are also seen.
LOCALITIES:
Finland; Sarany, Ural Mountains Region, Russia;
California and South Africa.
USES:
Gemstones and mineral specimens.
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