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Peridot
Gemstone
Peridot, sometimes called chrysolite, is a yellowish-green transparent variety of olivine. Peridot is one of the few gemstones that occur in only one color.
Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite... Wikipedia
Associated month: August
Hardness (Mohs hardness scale): 6.5 – 7
Chemical formula: (Mg,Fe)₂SiO₄
Birefringence: +0.036
Cleavage: Poor on, and,, cleavage improves with increasing iron content
Crystal system: Orthorhombic