820f5461_Mineral_ID_Key__2
[0] Shades of Green, olive, apple, dark to blackish, often mottled [1] 2½ to 4; rarely 5 to 6 in dense massive material [3] ANTIGORITE/ LIZARDITE/AMESITE (Serpentine Group) Generally (Mg,Al)3(Si,Al)2O5(OH)4 [4] Monoclinic, Orthorhombic and Triclinic [5] usually in crystalline masses, often platy or columnar [6] 2.4 to 2.79 (antigorite), 2.55 to 2.61 (lizardite), 2.71 to 2.80 (amesite) [7] These serpentine minerals are almost impossible to tell apart, particularly in massive forms. They may co-exist at the same locality. Still, information on the specific locality a specimen comes from may be the best bet for nailing down the ID. [2] 
sub-vitreous to greasy luster, feels greasy
Mineral ID_Key
2