Panskyite

Chemical formula: Pd₉Ag₂Pb₂S₄

Panskyite is a rare sulfide of palladium, silver, and lead, forming tiny, metallic grains in ultramafic rocks.

## Characteristics Panskyite is a very rare sulfide mineral, identified only in 2018. It occurs as very small, anhedral (irregularly shaped) grains, usually not exceeding 100 micrometers in size. Observed under a microscope in reflected light, it has a creamy white color and exhibits weak pleochroism from creamy to light gray. It is an opaque mineral with a metallic luster. ## History and Name The mineral's name honors Mikhail Dmitrievich Pansky, a Russian geologist and expert in nickel, copper, and platinum-group element deposits on the Kola Peninsula. It was approved as a new mineral species by the International Mineralogical Association (IMA) in 2018 (IMA2018-066). The discovery was made in copper-nickel ores from the West-Pana deposit, in the Fedorovo-Pansky massif, on the Kola Peninsula in Russia.

Properties

Mohs hardness: 4
Luster: Metallic
Streak: Black
Density: 10.59
Cleavage: None
Fracture: Uneven
Transparency: Opaque
Crystal system: Orthorhombic

Diagnostic features

## Identification Identification of panskyite is impossible without advanced laboratory techniques. It requires analysis in reflected light (ore microscopy) and chemical analysis using an electron microprobe (EDS/WDS) to confirm its unique composition – the simultaneous presence of palladium, silver, lead, and sulfur in specific proportions. ## Distinguishing from Similar Minerals It can be confused with other microscopic sulfides and platinum-group element alloys, such as polarite (Pd(Bi,Pb)), zvyagintsevite (Pd₃Pb), or atokite ((Pd,Pt)₃Sn). Final distinction is possible only based on precise chemical composition analysis. ## Crystal Forms Panskyite forms exclusively very fine, anhedral grains and aggregates of grains, often intergrown with other minerals.

Geological environment

## Genesis Panskyite forms as a result of hydrothermal processes within intrusions of ultramafic and mafic rocks (gabbro and norite). It crystallizes in the late stages of the formation of copper and nickel sulfide deposits, in association with platinum-group elements. ## Mineral Associations It co-occurs with chalcopyrite, pyrrhotite, pentlandite, as well as rarer minerals such as polarite, kotulskite, sperrylite, froodite, merenskyite, sobolevskite, and native gold. ## Localities The only confirmed occurrence (type locality) of panskyite is the West-Pana deposit in the Fedorovo-Pansky massif, Murmansk Oblast, Kola Peninsula, Russia.

Rarity

Extremely rare

For collectors

## Quality Criteria As a microscopic mineral, panskyite is not evaluated according to typical collector criteria such as size or color. The value of a specimen lies in its scientific significance and the confirmed presence of the mineral. The most valuable are research samples (microscopic polished sections) with well-isolated and analyzed grains, originating from the type locality.

Care and storage

## Cleaning Due to its extreme rarity and microscopic grain size, panskyite specimens are not subject to cleaning in the collector's sense. Any preparations (polished sections, samples) should be cleaned only by specialists under laboratory conditions, most often using compressed air or isopropyl alcohol. ## What to Avoid Contact with any chemicals, acids, and ultrasonic cleaning should be avoided, as these could damage or destroy the microscopic mineral grains and the surrounding rock matrix. ## Storage Specimens containing panskyite should be stored under stable conditions, in specialized micromineral boxes, protecting them from dust, moisture, and mechanical damage. Storage in a dry environment is crucial.

Sources

IMA Mineral List (CNMNC)