Pavonite
Chemical formula: Ag¹⁺Bi³⁺₃S²⁻₅
Pavonite is a rare silver bismuth sulfide, forming acicular or radiating aggregates with a metallic luster and steel-gray color.
Properties
- Mohs hardness
- 2
- Luster
- Metallic
- Streak
- Grayish black
- Density
- 6.8
- Transparency
- Opaque
- Crystal system
- Monoclinic
Diagnostic features
## Identification Pavonite can be identified by its characteristic acicular or radiating aggregates, steel-gray color, and metallic luster. Key diagnostic features include low hardness (2 on the Mohs scale) and very high density. Its occurrence in association with other bismuth and silver sulfosalts is also an important clue. ## Distinguishing from Similar Minerals This mineral can be confused with other sulfosalts of similar appearance, such as bismuthinite (Bi₂S₃), and also with stibnite (Sb₂S₃). Bismuthinite is very similar, but pavonite often forms more radiating aggregates. Stibnite has perfect cleavage in one direction, which pavonite does not exhibit. Final differentiation usually requires advanced analytical methods, such as X-ray diffraction (XRD). ## Crystal Forms Pavonite crystals are rare and usually appear as small, elongated blades or tabular forms. It is much more commonly found in the form of fibrous, acicular aggregates, as well as radiating rosettes and spheroidal clusters.
Geological environment
## Genesis Pavonite is a hydrothermal mineral. It forms in medium to high-temperature ore veins rich in bismuth and silver. It is a typical component of sulfide and sulfosalt parageneses. ## Mineral Associations This mineral often co-occurs with other ore minerals. Its most common associations include: bismuthinite, aikinite, tetrahedrite, cassiterite, arsenopyrite, pyrite, quartz, as well as native gold and bismuth. ## Localities The most important and historical localities for pavonite are in Bolivia, at its type locality – the Bolivar mine in Potosí. It is also known from other regions of this country. Outside Bolivia, its occurrences have been reported in Argentina, Peru, Mexico, the United States (Colorado, Nevada), Canada, as well as in Japan, China, Russia, the Czech Republic, and Switzerland.
Rarity
Rare
For collectors
## Quality Criteria The most valued specimens by collectors are those with well-formed, radiating aggregates or rare, macroscopic crystals. Aesthetic composition with other associated minerals, such as quartz or shiny pyrite, is also important. Specimens without mechanical damage, with a distinct metallic luster, achieve higher value. ## Popular Localities By far the most classic and sought-after pavonite specimens come from its type locality in Bolivia (Bolivar mine, Potosí). Specimens from this locality are considered exemplary for this mineral species.
Care and storage
## Cleaning Pavonite specimens should only be cleaned mechanically, using a soft brush to remove dust. Due to its low hardness, all actions must be carried out with the utmost care. The use of water, and especially chemical cleaning agents, is not recommended. ## What to Avoid Avoid contact with chemicals, acids, and detergents, which can damage the mineral's surface. Pavonite is soft and brittle, so it must be protected from impacts, scratching, and vibrations. Prolonged exposure to humid air can cause it to tarnish. ## Storage It is recommended to store pavonite specimens in closed, dry containers or display cases, away from minerals that could scratch it (e.g., quartz). It is best to keep it in its original collector's box, lined with soft material, to prevent mechanical damage.