A na-akpọkwa Tan kristal tii kristal, a na-akpọkwa anwụrụ ọkụ quartz (quartz brown) anwụrụ kristal na ink crystal Radioactive Ọtụtụ n'ime kristal tii bụ ogidi hexagonal.Dị ka kristal ndị ọzọ na-apụta ìhè, a na-enwe mgbe ụfọdụ nkọwa dị ka ice mgbawa, ígwé ojii na foogu.