ränidioksiidi (SiO2) üks polümorfne modifikatsioon mis on laialt levinud kivimites ja aherainena paljude maakide koosseisus; esineb looduslikult mitmetes vormides sh ahhaat, kaltsedon, ränikivi, opaal jne (vt ränidioksiid)
crystalline silicon dioxide (SiO2) widely distributed in rocks of all kinds; naturally occuring in many forms and varieties, such as agate, chalcedony, chert, flint, opal etc (see: silicon dioxide)
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