Chlorargyrite is a
silver chloride mineral with the simple formula AgCl. Chlorargyrite occurs as a secondary mineral phase in the
oxidation of silver mineral deposits. It crystallizes in the
isometric - hexoctahedral crystal class. Typically massive to columnar in occurrence it also has been found as colorless to variably yellow cubic crystals. The color changes to brown or purple on exposure to light. It is quite soft with a
Mohs hardness of 1 to 2 and dense with a
specific gravity of 5.55. It is also known as cerargyrite and, when weathered by desert air, as horn silver.
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General Information:
Chemical Formula:
AgCl
Composition:
(Molecular Weight = 143.32 gm)
Silver 75.26 %
AgChlorine 24.74 %
Cl Empirical Formula:
AgCl
Environment:
Oxidized portions of silver deposits.
IMA Status:
Approved IMA 1960
Locality:
Broken Hill district, New South Wales, Australia.
Name Origin:
Named after its chemical composition of chlorine (Greek, chloros = "pale green") and silver (Latin, argentum).
Physical Properties:
Cleavage:
None
Color:
purplish gray, green, white, or colorless.
Density:
5.55
Diaphaniety:
Transparent to translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Columnar - Forms columns,
Hardness:
1-1.5 - Talc or a little harder
Luminescence:
Non-fluorescent.
Luster:
Adamantine - Resinous
Streak:
white
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