'''Peridot''' ({{IPAc-en|ˈ|p|ɛ|r|ɪ|ˌ|d|ɒ|t|}} {{respell|PERR|ih|dot|}}), sometimes called '''chrysolite''', is a [[lime (color)|yellow-green]] transparent variety of [[olivine]]. Peridot is one of the few [https://gemsbuild.com/ gemstones[gemstone]]s that occur in only one color.
[https://gemsbuild.com/search?q=peridot&options%5Bprefix%5D=last&type=product&id=50382711816486&quantity=1 Peridot] can be found in [[mafic]] and [[ultramafic rock]]s occurring in [[lava]] and [[peridotite]] [[xenolith]]s of the [[mantle (geology)|mantle]]. The gem occurs in silica-deficient rocks such as volcanic [[basalt]] and [[pallasite|pallasitic]] [[meteorite]]s. Along with [[diamonds]], peridot is one of only two gems observed to be formed not in [[Earth's crust]], but in the molten rock of the upper mantle.<ref name="Rock & Gem Magazine 2023">{{cite magazine |title=Peridot crystals: Formation & locations |magazine=Rock & Gem Magazine |date=2023-07-10 |quote=Get to know this August birthstone |url=https://www.rockngem.com/peridot-crystals/ |via=rockngem.com |access-date=2024-01-21 |df=dmy-all }}</ref> Gem-quality peridot is rare on Earth's surface due to its susceptibility to alteration during its movement from deep within the mantle and weathering at the surface.<ref name="The University of Texas at Austin Gems">{{cite web | title=Peridot |department=Gem notes |id=course 347k |website=geo.utexas.edu |publisher=[[UT-Austin|The University of Texas]] |place=Austin, TX |series=Geology Department |url=https://www.geo.utexas.edu/courses/347k/redesign/Gem_Notes/Peridot/peridot_main.htm |access-date=2024-01-21 }}</ref> Peridot has a [[chemical formula]] of {{nobr| {{chem2|(Mg,Fe)2SiO4}}}}.
Peridot is one of the [[birthstone]]s for the month of August.<ref>{{cite periodical |title=Color, meanings, and symbolism [of] August birthstone peridot |periodical=[[Old Farmer's Almanac]] |via=almanac.com |url=https://almanac.com/august-birthstone-color-and-meaning }}</ref>
