Assertion: chalcedony's luster | /r/HasProperty | vitreous
Facets:
value: most often
type: DEGREE
value: to pearly
type: OTHER
Source sentences:
text: Chalcedony breaks with a conchoidal fracture and commonly displays a waxy, vitreous, or silky luster.
text: Luster is vitreous to almost pearly.
text: Most often, its luster is waxy, dull, or vitreous, but rarely, it may appear iridescent.
text: Luster is glassy to vitreous as crystals, while cryptocrystalline forms are usually waxy to dull, but can be vitreous.
text: The luster is vitreous, resinous or waxy.