Ma'adanai dauke kamar yadda wasu halitta abubuwa, waxanda suke da ruwa a karkashin al'ada yanayi (msl, 'yan qasar Mercury wanda ya zo da wata crystalline jihar a wani ƙananan zafin jiki). Ruwa, ya yi akasin haka, don ma'adanai ba la'akari, idan akai la'akari da shi a matsayin wani ruwa (narke) ma'adinai kankara.