Viteite

Chemical formula: Pd<sub>5</sub>InAs

Viteite is an extremely rare indium palladium arsenide, forming microscopic, metallic inclusions within other minerals.

## Characteristics Viteite is an indium palladium arsenide, occurring as extremely small, metallic grains, usually not exceeding 100 micrometers in size. It most commonly forms inclusions within other minerals, primarily chromite. When observed under a reflected light microscope, it has a creamy white color with a slight pinkish hue. ## Physical Properties Due to the microscopic size of the grains, most physical properties, such as hardness, density, luster, or transparency, have not been precisely determined. The mineral is opaque and exhibits a metallic luster. ## History and Name The mineral's name comes from its discovery location – the Vitim River in Buryatia, Russia. Viteite was officially approved by the International Mineralogical Association (IMA) in 2009 (IMA2009-026). It was described by a team of mineralogists: N. D. Tolstykh, E. M. Spiridonov, T. L. Evstigneeva, V. V. Krivenko, and T. N. Kerzin.

Properties

Luster
Metallic
Density
11.16
Transparency
Opaque
Crystal system
Cubic

Diagnostic features

## Identification Identification of Viteite is possible only through advanced laboratory techniques, such as reflected light microscopy and chemical analysis using an electron microprobe (EDS/WDS). Its characteristic chemical composition (palladium, indium, arsenic) is a key diagnostic feature. ## Distinguishing from similar minerals Under the microscope, it can be confused with other platinum-group minerals (PGM) of similar metallic appearance. Definitive differentiation requires chemical composition analysis. For example, it differs from majakite (PdNiAs) or stillwaterite (Pd₈As₃) by the presence of indium and specific elemental proportions. ## Crystal forms This mineral forms exclusively anhedral (irregularly shaped) grains and aggregates of microscopic size.

Geological environment

## Genesis Viteite forms in chromitite deposits associated with ultramafic (magnesium and iron-rich) igneous rock complexes. It forms during hydrothermal or magmatic processes in the late stages of crystallization, concentrating platinum-group metals. ## Mineral associations It most commonly co-occurs with chromite, in which it forms inclusions. It is also accompanied by other platinum-group minerals and their compounds, such as irarsite, laurite, sperrylite, as well as sulfide minerals like chalcopyrite, pentlandite, and bornite. ## Localities The only confirmed locality of Viteite in the world (type locality) is the alluvial platinum-group metal deposits in the Vitim River basin in Buryatia, in the Asian part of Russia.

Rarity

Extremely rare

For collectors

## Quality criteria As a microscopic mineral, Viteite is not acquired for aesthetic purposes. Its collector's value pertains to the entire rock specimen (usually chromitite) in which it has been identified. For collectors specializing in mineral systematics or platinum-group minerals, a specimen with analytically confirmed Viteite, originating from the type locality, holds the greatest value.

Care and storage

## Cleaning Due to its microscopic size and occurrence as inclusions, individual Viteite grains are not subject to cleaning. The host specimen (e.g., chromite) should be cleaned using methods appropriate for it, avoiding aggressive chemicals that could damage the inclusions. ## What to avoid Avoid contact with strong acids and chemical reagents that could react with arsenides and platinum-group metals. The specimen should not be subjected to ultrasound or abrupt temperature changes. ## Storage Specimens containing Viteite should be stored under stable conditions, in a dry place, away from dust and chemical contaminants. It is best to store them in closed display boxes or cabinets.

Sources

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