Vysotskite

Chemical formula: Pd<sup>₂+</sup>S<sup>₂-</sup>

Vysotskite is a rare palladium sulfide, most often forming microscopic, metallic grains in association with other platinum-group minerals.

## Characteristics Vysotskite is a palladium sulfide belonging to the copper group. It most often occurs as anhedral (irregular) grains, not exceeding several hundred micrometers in size, dispersed in other sulfides or rock-forming minerals. It rarely forms primitive, poorly developed crystals with a tetragonal outline. Its appearance is typically metallic, ranging in color from white to silvery-white, often with a yellowish or pinkish tint. ## Physical Properties This mineral is characterized by a metallic luster and is opaque. Its Mohs hardness is 2.5, and its density is high at 7.65 g/cm³. It exhibits no cleavage, and its fracture is uneven. ## Colors and Varieties The color of vysotskite is usually silvery-white, steel-gray, or white, often with a visible yellowish or pinkish tint, which is a characteristic feature. No named varieties are distinguished. ## History and Name The mineral was first described in 1962 by A.D. Genkin and I.V. Zvyagintsev. The name honors Nikolai Konstantinovich Vysotsky (1864–1932), a Russian geologist who was an authority on platinum deposits in the Urals. The type locality is the copper-nickel deposits in the Norilsk region of Siberia, Russia. ## Uses Due to its rarity and microscopic size, vysotskite has no direct industrial application. However, it is an important component of some palladium and platinum ores, making it of scientific and economic interest. It has purely collectible value for specialized micromineral collectors.

Properties

Mohs hardness: 2.5
Luster: Metallic
Streak: Black
Density: 7.65
Cleavage: None
Fracture: Uneven
Transparency: Opaque
Crystal system: Tetragonal

Diagnostic features

## Identification Identifying vysotskite is extremely difficult without specialized equipment. In polished sections under a reflected light microscope, it can be recognized by its characteristic anisotropy (color change in polarized light) from gray to yellowish-brown, and by its color with a pinkish or yellowish tint. Final confirmation requires chemical analysis (EDS/WDS) to confirm the presence of palladium and sulfur. ## Distinguishing from Similar Minerals It can be confused with other platinum-group sulfides, such as braggite ((Pt,Pd,Ni)S) or cooperite (PtS). Braggite is optically very similar but usually has a grayer color. Cooperite is also similar but crystallizes in a different system. Definitive differentiation is only possible through analytical methods. ## Crystal Forms Crystals are extremely rare and poorly formed, with prismatic or tabular habits. Most often, it occurs as irregular, anhedral grains and inclusions within other minerals.

Geological environment

## Genesis Vysotskite crystallizes under magmatic conditions, in ultramafic and mafic layered intrusions, as one of the late products of sulfide crystallization. It forms in nickel, copper, and platinum-group element deposits. ## Mineral Associations This mineral co-occurs with other platinum-group minerals (PGM) and base metal sulfides. Its typical associated minerals include: braggite, cooperite, chalcopyrite, pentlandite, pyrrhotite, as well as native platinum and gold. ## Localities The most important localities worldwide, from which well-studied specimens originate, are the Norilsk region deposits (Talnakh, Oktyabrskoye) in Siberia, Russia. It also occurs in the Bushveld Complex in South Africa, the Sudbury Complex in Canada, and the Stillwater Complex in Montana, USA. These are all world-class platinum-group element deposits.

Rarity

Very rare

For collectors

## Quality Criteria In the case of vysotskite, which is a micromineral, the value of a specimen is primarily determined by the abundance of its occurrence and the certainty of identification. Most prized are samples where vysotskite grains are relatively large (above 0.1 mm) and clearly visible against the rock matrix or in association with other rare minerals. Crucial is the accompanying analytical documentation confirming the chemical composition. ## Popular Localities Decidedly the most valued and classic specimens come from the copper-nickel deposits in the Norilsk region of Russia, which is its type locality. Specimens from the Bushveld Complex (South Africa) and Sudbury (Canada) are also sought after by specialized collectors.

Care and storage

## Cleaning Specimens containing vysotskite, which are usually polished sections or rock fragments, do not require cleaning. If necessary, dust can be removed with a soft brush or compressed air. Avoid contact with water and chemicals. ## What to Avoid The mineral is sensitive to acids and strong oxidizers, which can damage it. It should be protected from moisture to prevent slow oxidation. Avoid scratching, as it is a relatively soft mineral. ## Storage Specimens should be stored in a dry place, preferably in a closed "micromount" box, to protect them from dust, moisture, and mechanical damage. Polished sections should be stored in a way that protects their surface from scratching.

Sources

IMA Mineral List (CNMNC)