is a an andradite/grossular mixed type as every garnet is almost never pure member of its family.
The general formula is A3B2(SiO4) and hardness of 7 .More information can be found on the web.
The green variety has been discovered in 1994 in Mali.It’s composition is Ca3Al2(SiO4)3 and colors are from yellowish green to brown and intermediated hues.
It’s a very nice stone and the value can change a lot depending on the size and clarity.Big size clean stones are not common.
This stone here is eye clean.