Pyrargyrite
Pyrargyrite is a sulfosalt mineral recognized among collectors for its crystal form and distribution, with several world-class Chinese localities.
About Pyrargyrite
Pyrargyrite belongs to the sulfosalt class in the proustite group and has the chemical formula Ag3SbS3. It crystallizes in the trigonal system and is relatively soft, requiring careful handling. Its combination of structural character and global distribution make it a recognized species in both systematic and aesthetic collections.
Identification & care
Pyrargyrite typically forms prismatic, hemimorphic crystals; massive; granular. Its color is typically deep red, dark crimson and purplish red (darker than proustite). The luster is adamantine, sub-metallic, the streak is purplish red, and specimens are typically translucent in thin fragments. The cleavage is distinct on {10-11}. The fracture is conchoidal to uneven, which aids identification.
Collector context
How it forms
In terms of geology, Pyrargyrite forms in low-temperature hydrothermal silver veins; more common than proustite in most silver districts. It is commonly found in association with proustite, native silver, stephanite, argentite/acanthite, galena, calcite.
Classic Chinese localities
Documented Chinese occurrences are recorded at Xianghualing Sn-polymetallic ore field, Dachang ore field and Yaogangxian W-Sn ore field, among others.
Why collectors care
Pyrargyrite is a frequently-sought species in serious collections because its habit is recognizable, its color often strong, and its best examples unmistakable even at a distance. Chinese material has driven much of the recent visual shift in the species — sharper crystals, deeper colors, cleaner matrix.
What affects value
Value in Pyrargyrite is assessed, in typical order of weight, against: (1) locality provenance; (2) size relative to the species norm; (3) crystal form and termination sharpness; (4) color saturation and zoning; (5) transparency and internal clarity; (6) matrix quality and aesthetic balance; (7) condition (absence of damage, chips, or repair). Cleaning quality and verified locality documentation act as multipliers across the above.
Naming history
The name Pyrargyrite has a specific etymological and historical context — see Mindat's reference entry for provenance details. We have retained naming data at the record level; published prose is paraphrased from factual fields rather than copied from source.