Proxidecagonite

Chemical formula: Al₃₄Ni₉Fe₂

Proxidecagonite is a synthetic, metallic alloy of aluminum, nickel, and iron, not a naturally occurring mineral.

## Characteristics Proxidecagonite is a name assigned to a synthetic metallic phase (alloy) in the Al-Ni-Fe system. It is not a mineral approved by the International Mineralogical Association (IMA) because it does not occur naturally. Its structure is complex and classified as a decagonal quasicrystal, meaning it possesses long-range order but without the periodicity typical of classical crystals. Due to its synthetic nature, it does not form specimens in the mineralogical sense. ## Physical Properties As a metal alloy, it possesses properties typical of such materials, including metallic luster and opacity. Hardness and density are not typically measured using mineralogical scales. ## History and Name The name "Proxidecagonite" is not an official mineralogical name. It is a term used in materials science to describe a specific quasicrystalline phase. Research on quasicrystals in the Al-Ni-Fe system has been conducted since the 1980s, and their discovery revolutionized crystallography.

Properties

Luster
Metallic
Streak
Black
Transparency
Opaque
Crystal system
Orthorhombic

Diagnostic features

## Identification Identification of this phase requires advanced laboratory techniques such as X-ray diffraction (XRD) or transmission electron microscopy (TEM), which are capable of revealing its unique, non-periodic atomic structure. It cannot be identified using methods employed in amateur mineralogy.

Geological environment

## Genesis Proxidecagonite is a product of laboratory synthesis. It is formed under strictly controlled conditions, typically by melting and slow cooling of an aluminum, nickel, and iron alloy in appropriate proportions. Its natural occurrence in any geological environment is unknown.

Rarity

Synthetic material - does not occur in nature

For collectors

## Quality Criteria As a synthetic material, Proxidecagonite is not an object of interest for mineral collectors. Its value is purely scientific and research-oriented in the fields of solid-state physics and materials science.

Care and storage

## Cleaning Specimens should be handled with gloves to avoid leaving fingerprints and contamination. Compressed air or a very soft brush can be used to remove dust. ## What to Avoid Avoid contact with chemicals, especially acids and bases, which can react with metals. Do not expose it to moisture to prevent potential oxidation. Store away from abrasive materials that could scratch its surface. ## Storage It is recommended to store in stable conditions, preferably in a closed, padded box or display case away from dust and moisture. The use of capsules or pouches with a desiccant can further protect the specimen.

External references

Sources

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