|PYRARGYRITE MINERAL FACTS|
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Pyrargyrite Mineral Facts:
Chemical Formula: Ag3SbS3 Pyrargyrite is 59.7% Silver by weight. Also known as Dark Ruby Silver.
Dark Gray to black.
2 to 2.5
Cleavage: The cleavage of pyrargyrite is distinct parallel to R(1011). Its fracture is conchoidal or uneven.
Luster:. Adamantine, transparent to translucent.
Optics: (Refractive Index) 2.9 (very high index of refraction)
Identification and Diagnostics
The color and streak of pyrargyrite, together with its translucency, distinguish it from nearly all other minerals. Its reaction for silver serves to distinguish it from cuprite, cinnabar and realgar, which it sometimes resembles. The distinction between this mineral and its isomorph, proustite, is based on the streak and the reaction for antimony.
Localities and Origins:
The mineral is an important ore of silver in Mexico and in the western United States. It is usually associated with other sulfur bearing ores of silver, the metal being extracted from the mixture by various processes. The name is derived from two Greek words meaning fire-silver.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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