Tan kristaliste nayo yitwa icyayi cya kristu, naho umwotsi wa quartz (brown quartz) nanone bita umwotsi wa kirisiti hamwe na wino ya kirisiti ya kirisitu Byinshi mubyuma byicyayi ni inkingi esheshatu.Kimwe nizindi kristu zibonerana, harigihe habaho ibisobanuro nkibarafu, ibicu nibicu.