In mineral terms the difference between cryolite and arcubisite
is that cryolite is the mineral sodium aluminium fluoride (Na3AlF6) while arcubisite is a sulfosalt mineral occurring with cryolite in Greenland.
cryolite
Noun
(label) The mineral sodium aluminium fluoride (Na3AlF6).
arcubisite
Noun
(-)
(mineral) A sulfosalt mineral occurring with cryolite in Greenland.