I-Tan crystal ibizwa nangokuthi ikristalu yetiye, kanti i-quartz yentuthu (i-quartz ensundu) ibizwa nangokuthi ikristalu yentuthu kanye nekristalu kayinki I-Radioactive Iningi lamakristalu etiye angamakholomu angama-hexagonal.Njengamanye amakristalu asobala, kwesinye isikhathi kunezincazelo ezinjengokuqhekeka kweqhwa, ifu nenkungu.