Spodumene
Gemstone
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Spodumene is a pyroxene mineral consisting of lithium aluminium inosilicate, LiAl(SiO₃)₂, and is a commercially important source of lithium. It occurs as colorless to yellowish, purplish, or lilac kunzite, yellowish-green or emerald-green... Wikipedia
Chemical formula: LiAlSi₂O₆
Hardness (Mohs hardness scale): 6.5 – 7
Refractive index: 1.66 – 1.68
Density: 3.2 g/cm3
Cleavage: Perfect prismatic, two directions∧, at 87°
Crystal system: Monoclinic