Qandilite (Mg,Fe++)2(Ti,Fe+++,Al)O4
Qilianshanite NaH4(CO3)(BO3)·2(H2O)
Qingheiite Na2(Mn++,Mg,Fe++)(Al,Fe+++)(PO4)3
Qitianlingite Fe++2Nb2W++++++O10
Quadratite Ag(Cd,Pb)AsS3
Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4
Quadruphite-VII Na14CaMgTi4[Si2O7]2(PO4)4O4F2
Quadruphite-VIII Na14CaMgTi4(Si2O7)2(PO4)4O4F2
Quartz Chert - cryptocrystalline quartz
Agate - banded variety of chaledony
Amethyst - purple
Avanturine - feebly translucent chalcedony
Carnelian - flesh red chalcedony
Rose Quartz - rose colored
Chalcedony - microcrystalline quartz
Tiger Eye - pseudomorph of asbestos
Chrysoprase - apple green chalcedony
Citrine - yellow
Sapphire Quartz - blue colored
Cat's Eye - chatoyant
Smoky Quartz - brown to black
Flint - microcrystalline quartz
Rock Crystal
Prase - leek green chalcedony
Plasma - green chalcedony
Moss Agate - variety of chaledony
Jasper - red or brown chalcedony
Hornstone - flint
SiO2
Queitite Pb4Zn2(SiO4)(Si2O7)(SO4)
Quenselite PbMn+++O2(OH)
Quenstedtite Fe+++2(SO4)3·10(H2O)
Quetzalcoatlite Zn8Cu4(TeO3)3(OH)18
Quintinite-2H Mg4Al2(OH)12CO3·4(H2O)
Quintinite-3T Mg4Al2(OH)12CO3·4(H2O)