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Also known as topaz of Theophrastus, olvine, chrysolite

Peridot ( ), sometimes called chrysolite, is a yellow-green transparent variety of olivine. Peridot is one of the few gemstones that occur in only one color.

Key facts

Mineral.name: Peridot
Mineral.category: Silicate minerals
Mineral.boxbgcolor: acdf7d
Mineral.image: Forsterite-Olivine-tmu14a.jpg
Mineral.color: Yellow, to yellow-green, olive-green, to brownish, sometimes a lime green, to emerald hue
Mineral.system: Orthorhombic
Mineral.twinning: Uncommon, simple twinning can occur on {100}, {011},{012}, cyclic twinning on {031}
Mineral.cleavage: Poor on {010} and {110}, {010} cleavage improves with increasing iron content
Mineral.fracture: Conchoidal
Mineral.mohs: 6.5–7
Mineral.luster: Vitreous to oily
Mineral.refractive: 1.64–1.70
Mineral.birefringence: +0.036
Mineral.pleochroism: Weak pale yellow-green to yellow, yellow to yellow orange
Mineral.streak: Colorless
Mineral.gravity: 3.2–4.3
Mineral.melt: between 1,200 and 1,900°C
Mineral.fusibility: Infusible avoid thermal shock