Wasu ma'adanai suke a cikin amorphous jihar da kuma ba shi da wani crystalline tsarin. Wannan ya shafi yafi zuwa t. Ake kira. metamict ma'adanai da ciwon waje nau'i na lu'ulu'u ne, amma su ne a cikin wani amorphous, glassy jihar saboda da hallaka na asali crystal raga a ƙarƙashin rinjayar da wuya radiation cikin nasu abun da ke ciki na rediyoaktif abubuwa (U, Th, da sauransu.). Bambanta yavnokristallicheskie ma'adanai, amorphous - metakolloidy (misali, opal, Lechatelierite et al.) Kuma metamict ma'adanai da ciwon waje nau'i na lu'ulu'u ne, amma su ne amorphous, glassy jihar.