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Color is clear or white to yellowish, but can also be black or purple.
Luster is vitreous.
Transparency crystals are transparent to translucent.
Crystal System is monoclinic; 2/m
Crystal Habits are usually massive and as pseudo-cubic crystals, some
with psuedo-octahedral truncations.
Cleavage is absent, but three parting directions produce what looks like a
psuedo-cubic cleavage.
Fracture is uneven.
Hardness is 2.5 - 3
Specific Gravity is 2.95 (average)
Streak is white.
Other Characteristics: index of refraction is 1.338 which is close to the
index of refraction of water. As a consequence, clear cryolite crystals or
powdered cryolite will nearly disappear in water. Also there is no salty
taste which is helpful in distinguishing cryolite from the mineral halite.
Associated Minerals include siderite, quartz, topaz, fluorite, chalcopyrite,
galena, cassiterite,molybdenite, columbite and wolframite.
Notable Occurrences include Ivigtut area of Greenland and also at the
foot of Pikes Peak at Creede, Colorado, USA, Mont Saint-Hilaire and
Francon Quarry, Montreal, Quebec, Canada and at Miask, Russia.
Best Field Indicators are lack of salty taste, density, index of refraction,
locality and crystal habit.
Synthetic Cryolite(Na3AlF6) is a white crystalline powder manufactured from
hydrofluoric acid,sodium carbonate,and aluminium.Synthetic cryolite is used chiefly
as a flux in the electrolytic production of aluminum as it effectively lowers down the
melting point of the alumina.It is used in the glass and enamel industries,in bonded
abrasives as a filler,in making salts of sodium and alumium and porcelaneous glass
and in the manufacture of insecticides,Cryolite is a relatively safe fruit and
vegetable insecticide.the fluoride ion inhibits many enzymes that contain
iron,calcium and magnesium.
|
Items
| Grade | CH-0 | CH-1 | CM-0 | CM-1 | |
| Chemical
Compositions(%) |
F
| ≥ | 52 | 52 | 53 | 53 |
|
Al
| 12 | 12 | 13 | 13 | ||
|
Na
| ≤ | 33 | 33 | 32 | 32 | |
|
SiO2
| 0.25 | 0.36 | 0.25 | 0.36 | ||
|
Fe2O3
| 0.08 | 0.08 | 0.05 | 0.08 | ||
|
SO4
| 0.6 | 1.0 | 0.6 | 1.0 | ||
|
CaO
| 0.15 | 0.20 | 0.20 | 0.60 | ||
|
P2O5
| 0.02 | 0.03 | 0.02 | 0.03 | ||
|
Moisture
| 0.20 | 0.40 | 0.20 | 0.40 | ||
|
Physical
Properties(%)
| Loss of Ignition
| 2.0 | 2.5 | 2.0 | 2.5 |