enamike maakide aheraine ja valutööstuses kasutatava kvartsliiva peamine koostisosa – ränidioksiid SiO2; esineb viis polümorfset erimit: kvarts (enimlevinud), tridümiit, kristobaliit, koesiit ja stišoviit (vt kvarts; kvartsliiv)
the dioxide of silicon (SiO2), the most common mineral in the majority of sands; occurs in five crystalline polymorphs: quartz, tridymite, cristobalite, coesite, and stishovite (see: quartz; quartz sand)
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