Tsavorite

Variety Ca3Al2(SiO4)3

Also called Tsavolite

About it

Green grossular garnet coloured by vanadium and chromium, found in East Africa in the late 1960s and named for Tsavo National Park in Kenya. Also mined in Tanzania; usually untreated.

Type
Variety
Group
Grossular variety (garnet)
Formula
Ca3Al2(SiO4)3
Hardness (Mohs)
7–7.5
Specific gravity
3.57–3.73
Streak
white
Lustre
vitreous (glassy)
Crystal system
Isometric (cubic)
Colours
light to deep green
Transparency
transparent
Cleavage and fracture
none; conchoidal to uneven fracture

Typical values: real specimens vary. For more, see mindat.org.