Quartz yog cov ntxhia muaj li ntawm silica, nrog rau cov tshuaj formula SiO2. Ntshiab quartz yog xim tsis muaj xim thiab pob tshab, thiab nthuav tawm ntau yam xim vim muaj cov kab pigment ions los yog kev sib cais zoo sib xws, lossis muaj cov chaw xim, uas txo cov pob tshab. Nrog vitreous luster, qhov tawg yog oily luster. Hardness 7, tsis muaj cleavage, conchoidal puas. Lub ntiajteb txawj nqus 2.65. Piezoelectric.
