Zlatogorite

Chemical formula: CuNiSb<sub>₂</sub>

Zlatogorite is an extremely rare mineral, a copper-nickel antimonide, occurring as microscopic, metallic grains.

## Characteristics Zlatogorite is a copper-nickel antimonide, belonging to the sulfides. It forms exclusively microscopic, anhedral (irregular) grains not exceeding 0.1 mm in size. It most often occurs as rims and intergrowths with native antimony or as inclusions in other minerals. It is opaque and has a metallic luster. ## Physical Properties Its Mohs hardness is 4.5. The density, calculated based on chemical composition and unit cell parameters, is 8.15 g/cm³. Due to the microscopic size of the grains, features such as cleavage or fracture have not been determined. ## Colors and Varieties On a fresh surface, it has a creamy-white color with a distinct reddish tint. No color varieties or commercial varieties are known. ## History and Name The mineral was first described in 1995 by S. F. Sluzhenikin, N. V. Trubkin, and L. N. Vyal'sov. Its name comes from the discovery locality – the Zlatogorsk deposit (Golden Mountain) in the Karaganda region of Kazakhstan. ## Applications Zlatogorite has no industrial applications. Its significance is purely scientific and collectible, as a unique mineralogical species.

Properties

Mohs hardness: 4.5
Luster: Metallic
Streak: Black
Density: 8.15
Cleavage: None
Transparency: Opaque
Crystal system: Tetragonal

Diagnostic features

## Identification Identification of zlatogorite is impossible without advanced analytical techniques. Due to its microscopic size and occurrence in paragenesis with other metallic minerals, the only reliable method of identification is chemical composition analysis using an electron microprobe (EDS/WDS) on a polished surface (polished section). ## Distinguishing from Similar Minerals It can be confused with other fine-grained antimonides and sulfides with which it co-occurs, such as nisbite, ullmannite, or chalkostynite. Differentiation based on visual characteristics is unfeasible – it requires chemical analysis. ## Crystal Forms Zlatogorite forms irregular, anhedral grains, often as rims around native antimony crystals or as small inclusions in other ore minerals.

Geological environment

## Genesis It is a hydrothermal mineral, forming under low-temperature conditions. It occurs in ore veins cutting sedimentary rocks – carbonaceous-siliceous shales and dolomites. ## Mineral Associations It most commonly co-occurs with native antimony, nisbite, ullmannite, chalkostynite, tetrahedrite, chalcopyrite, pyrite, galena, and sphalerite. ## Localities The only confirmed occurrence of zlatogorite in the world is its type locality – the Zlatogorsk deposit in the Altyn-Kazgan area, Karaganda region, Kazakhstan.

Rarity

Extremely rare

For collectors

## Quality Criteria Zlatogorite is not a mineral acquired for aesthetic purposes. The collectible value of a specimen lies solely in the presence of an analytically confirmed, even microscopic, grain of this mineral. A specimen is a fragment of the host rock from the type locality. ## Market Prices There is no established market for this mineral. Specimens appear on the market extremely rarely, mainly through exchange between scientific institutions and specialized collectors of systematic minerals. ## Popular Localities The only source of specimens is the Zlatogorsk deposit in Kazakhstan.

Care and storage

## Cleaning Due to the microscopic nature of the grains, cleaning individual zlatogorite specimens is neither possible nor practiced. Any cleaning applies only to the host rock in which the mineral occurs and should be limited to gently removing dust with compressed air or a soft brush. ## What to Avoid As an antimonide and sulfide, zlatogorite is potentially sensitive to moisture and oxygen, which can lead to its oxidation and tarnishing. Contact with water, acids, and other chemicals should be strictly avoided. ## Storage Specimens containing zlatogorite should be stored in a dry and stable environment. Airtight "membrane box" containers or boxes with a desiccant are recommended to minimize the risk of mineral degradation.

Sources

IMA Mineral List (CNMNC)