cryolite
Noun
Meaning
A fluoride of sodium and aluminum, found in Greenland, in white cleavable masses; -- used as a source of soda and alumina.
Source: Webster's dictionarySynonyms
emery
clay
crystal
brimstone
mineral
calcite
alabaster
bauxite
fluorite
carbon
coal
boron
asphalt
cobalt
asbestos
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The plant offered two advantages: (i) energy requirements were 40% less than plants using the Hall–Héroult process, and (ii) the more accessible kaolinite (instead of bauxite and cryolite ) was used for feedstock.
When cryolite is used for the preparation of alum, it is mixed with calcium carbonate and heated.