GARNET


All facts and figures taken from the GIA

GARNET

Garnets are a set of closely related minerals forming a group, with gemstones in almost every color. Red garnets have a long history, but modern gem buyers can pick from a rich palette of garnet colors: greens, oranges, pinkish oranges, deeply saturated purplish reds, and even some blues. Red garnet is one of the most common and widespread of gems. But not all garnets are as abundant as the red ones. A green garnet, tsavorite, is rarer and needs rarer rock chemistries and conditions to form.


MINERAL: Garnet group
CHEMISTRY: Almandine– Fe3Al2(SiO4)3
Andradite– Ca3Fe2(SiO4)3
Grossular– Ca3Al2(SiO4)3
Pyrope– Mg3Al2(SiO4)3
Rhodolite– (Mg, Fe)3Al2(SiO4)3
Spessartine– Mn3Al2(SiO4)3
COLOR: All colors
REFRACTIVE INDEX: 1.714-1.888
BIREFRINGENCE: None
SPECIFIC GRAVITY: 3.47-4.15
MOHS HARNESS: 6.5-7.5


Garnet is the birthstone for January and the gem for the second anniversary.

FOUND WHERE

Precious_Gemstone_Where_Found_Garnet