Kryachkoite

Chemical formula: (Al,Cu)₆(Fe,Cu)

Kryachkoite is a metallic mineral with the composition (Al,Cu)₆(Fe,Cu), identified as a phase in the Khatyrka iron meteorite.

Kryachkoite is an IMA-approved mineral from 2016, however, its characterization is very limited due to its extreme rarity and microscopic grain sizes. It was discovered in the Khatyrka iron meteorite, found in the Koryak Mountains in the Russian Far East. It occurs as irregular grains up to 10 micrometers in size, in association with other rare minerals such as khatyrkite, cupalite, and the newly discovered decagonite. Its chemical composition is an alloy of aluminum, copper, and iron. Due to the nature of the find, most physical properties remain unknown or are only estimated.

Properties

Luster
Metallic
Density
3.79
Transparency
Opaque
Crystal system
Orthorhombic

Diagnostic features

## Identification Identification of kryachkoite is only possible using advanced analytical methods, such as electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), due to its microscopic size and occurrence in a complex mineral association within the meteorite.

Geological environment

## Genesis Kryachkoite is an extraterrestrial mineral. It formed under conditions present in the parent body of the Khatyrka meteorite, likely as a result of shock or metamorphic processes occurring in space. ## Mineral associations It co-occurs with other minerals identified in the Khatyrka meteorite, such as khatyrkite (CuAl₂), cupalite (CuAl), decagonite (Al₇₁Ni₂₄Fe₅), spinel, diopside, forsterite, and unknown Al-Cu-Fe phases. ## Localities The only known occurrence of kryachkoite on Earth is the Khatyrka iron meteorite, found in 1979 in the Koryak Mountains (Chukotka Autonomous Okrug, Russia).

Rarity

Extremely rare

For collectors

Kryachkoite, due to its microscopic size and occurrence exclusively in a single meteorite, is not available on the collector's market. Its value is purely scientific. Fragments of the Khatyrka meteorite in which it was identified are held in the collections of research institutions, such as the Natural History Museum in Florence, Italy.

Care and storage

## Cleaning Due to its extreme rarity and occurrence as microscopic grains within the meteorite, mechanical or chemical cleaning of individual specimens is impossible and inadvisable. Any attempt at isolation or cleaning risks destroying the material. ## What to avoid Avoid all chemicals, ultrasound, temperature changes, and moisture. Meteorite specimens containing kryachkoite should be protected from oxidation and degradation under controlled conditions. ## Storage Store in a stable, dry environment, preferably in a sealed container with a desiccant. Protect from light and contaminants. The safest place for such rare material is a scientific institution or museum.

External references

Sources

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