Sidorovite

Chemical formula: PtFe<sub>3</sub>

Sydorowite is a very rare mineral from the native elements group, being a natural alloy of platinum and iron, found in ultramafic rock complexes.

## Characteristics Sydorowite is an extremely rare mineral, a natural alloy (intermetallic compound) of platinum and iron. It occurs as small, irregular grains or inclusions within other minerals, typically submillimeter in size. Its observation most often requires the use of a microscope. Due to its chemical composition, it is characterized by a metallic appearance and high density. ## Physical Properties This mineral features a strong, metallic luster. It is opaque. Its hardness and density have not been precisely measured due to its small size and rarity, but they are estimated to be high, typical for platinum alloys. ## History and Name The mineral's name honors Anatoliy Vasilyevich Sidorov (1932-1977), a Russian geologist and specialist in ore deposit geology, who made significant contributions to geological research in northeastern Russia. The mineral was approved by the IMA in 1999, and its discovery was made on material from the Kondyor Massif in Khabarovsk Krai in the Russian Far East.

Properties

Luster
Metallic
Transparency
Opaque
Crystal system
Cubic

Diagnostic features

## Identification Identification of sydorowite is possible almost exclusively using advanced laboratory techniques. In polished sections under a polarizing microscope in reflected light, it exhibits characteristic optical properties. Final confirmation requires chemical analysis using an electron microprobe (EDS/WDS) or X-ray diffraction (XRD). ## Distinguishing from Similar Minerals It can be confused with other natural platinum-iron alloys, such as tetraferroplatinum (PtFe) or tulameenite (Pt₂FeCu). Differentiation is based solely on precise analysis of the platinum-to-iron ratio and other elements in the chemical composition. ## Crystal Forms Sydorowite forms exclusively anhedral (irregular) grains and aggregates of small sizes, usually below 0.1 mm. No well-formed crystals have been observed.

Geological environment

## Genesis Sydorowite forms in ultramafic, alkalized rock complexes, particularly in dunites and pyroxenites. Its crystallization is associated with magmatic and metasomatic processes occurring in a platinum-group element-rich environment. ## Mineral Associations This mineral co-occurs with other platinum-group elements and ore minerals. It is most often accompanied by: tetraferroplatinum, tulameenite, chromite, magnetite, and other rare platinum-group minerals (PGM). ## Localities The only confirmed and detailed described occurrence (type locality) is the Kondyor Massif in Khabarovsk Krai in the Russian Far East. This is one of the world's most important platinum-group element deposits, known for the occurrence of many rare minerals of this group.

Rarity

Extremely rare

For collectors

## Quality Criteria The collector's value of sydorowite is purely scientific and systematic. Due to its microscopic size, it does not form aesthetic specimens. The most valuable samples (most often in the form of microscopic polished sections) are those from a well-documented type locality, containing possibly large and chemically pure grains, whose identity has been confirmed by analysis.

Care and storage

## Cleaning Due to the microscopic nature of its occurrence, isolated sydorowite grains are practically not cleaned. When cleaning the host rock in which it occurs, mechanical methods or ultrasonication in distilled water should be used, avoiding aggressive chemicals. ## What to Avoid Contact with strong acids, especially aqua regia, which can dissolve the mineral, should be avoided. Although it is a stable alloy, prolonged exposure to an aggressive chemical environment can lead to its degradation. ## Storage Specimens containing sydorowite should be stored under stable conditions, away from moisture and chemical contaminants. They are most often stored as microscopic preparations (polished sections) or in specialized display boxes.

Sources

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