cryoconite
/krʌɪə(ʊ)ˈkəʊnʌɪt/(also cryokonite, kryoconite, kryokonite) Geology
noun
A grey sediment found at the bottom of holes in the surface of an ice field or glacier, consisting chiefly of wind-blown dust and often also microorganisms.
Origin
Late 19th century. From cryo- + ancient Greek κόνις dust + -ite.