Assertion: quality peridot | /r/AtLocation | a fraction of these settings
Facets:
Source sentences:
text: Olivine, of which peridot is a type, is a common mineral in mafic and ultramafic rocks, often found in lava and in peridotite xenoliths of the mantle, which lava carries to the surface; however, gem-quality peridot occurs in only a fraction of these settings.