CHLORARGYRITE

'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''.
It was first described in 1877 for occurrences in the Broken Hill district, New South Wales, Australia. The name is from the Greek, chloros for "pale green" and Latin for silver, argentum.

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References

References

★ Palache, C., H. Berman, and C. Frondel (1951) Dana’s system of mineralogy, (7th edition), v. II, pp.11–15

★ Webmineral data

★ Mindat with location data

★ Mineral Data Publishing PDF