TSAVORITE, a green gemstone variety of grossular garnet
VARIETY INFORMATION:
- VARIETY OF: Grossular garnet, Ca3 Al2 Si3 O12.
- USES: Gemstone.
- COLOR: various shades of green.
- INDEX OF REFRACTION: 1.73 - 1.75
- HARDNESS: 6.5 - 7
- CLEAVAGE: none
- CRYSTAL SYSTEM: isometric
- SPECIMENS
Tsavorite is one of the gem varieties of the
garnet mineral called
grossular.
The more common gem variety of grossular is called
hessonite.
Gem quality tsavorite is found at Tsavo, Kenya.
The green color is caused by trace amounts of vanadium.
Tsavorite is not the only green garnet. While
Uvarovite is almost never used as a gemstone
(the crystals tend to be tiny), the green
andradite garnet variety called
demantoid is
sometimes cut for gems.
Distinguishing them can be difficult, but experienced gem dealers are capable of doing so.