Czochralskiite

Chemical formula: Na<sub>4</sub>Ca<sub>3</sub>Mg(PO<sub>4</sub>)<sub>4</sub>

Czochralskiite is an extremely rare sodium, calcium, and magnesium phosphate, discovered in a meteorite and named after the Polish chemist Jan Czochralski.

## Characteristics Czochralskiite is a mineral from the phosphate group, belonging to the broader alluaudite supergroup. It occurs as very small, irregular (anhedral) grains, usually not exceeding 200 micrometers in size. It is colorless and transparent, with a vitreous luster. Due to its microscopic size and occurrence only as inclusions in other material, it does not form specimens in a form familiar to collectors. ## Physical Properties The mineral's hardness on the Mohs scale is approximately 5. It has a vitreous luster and is transparent. The density calculated based on its chemical composition and crystal structure is 3.13 g/cm³, but it has not been empirically measured due to the lack of sufficiently large material. ## Colors and Varieties The mineral is colorless. No colored varieties or trade names are known. ## History and Name Czochralskiite was officially recognized as a new mineral by the International Mineralogical Association (IMA) in 2022. It was identified in a pallasite – a type of stony-iron meteorite – named North West Africa (NWA) 856. The mineral's name honors the Polish chemist, Professor Jan Czochralski (1885–1953), inventor of the widely used method for growing single crystals, known as the Czochralski method. ## Applications Czochralskiite has no commercial or industrial applications. Its significance is purely scientific, providing information about the mineralogical processes occurring in meteorite parent bodies.

Properties

Mohs hardness
5
Luster
Vitreous
Streak
White
Density
3.13
Transparency
Transparent
Crystal system
Trigonal

Diagnostic features

## Identification Identification of czochralskiite is impossible without advanced analytical techniques. Recognition is based on chemical composition analysis using electron microprobe analysis (EMPA) and on crystal structure examination by single-crystal X-ray diffraction. Visually, as microscopic, colorless grains, it is indistinguishable from many other minerals. ## Differentiation from Similar Minerals Czochralskiite belongs to the alluaudite supergroup and is closely related to other phosphates in this group. Differentiating it from minerals such as alluaudite, ferroalluaudite, or bobfergusonite requires precise chemical analysis to determine the dominant elements in specific structural sites. ## Crystal Forms This mineral does not form well-developed crystals (it is anhedral). It occurs exclusively as irregular, rounded grains embedded in the matrix of other meteorite minerals.

Geological environment

## Genesis Czochralskiite has an extraterrestrial origin. It formed by crystallization from a phosphate-rich melt within the parent body of the NWA 856 pallasite. This process occurred under very slow cooling conditions, which allowed for the formation of complex phosphates. ## Mineral Associations This mineral occurs in paragenesis with other phosphates found in the NWA 856 meteorite, such as stanfieldite and merrillite. The whole is embedded in the main mass of the meteorite, consisting of olivine and an iron-nickel alloy (kamacite and taenite). ## Localities The only confirmed locality of czochralskiite in the world is the North West Africa (NWA) 856 meteorite. The exact terrestrial location where this meteorite was found is not precisely known, which is typical for many finds from the desert regions of Northwest Africa.

Rarity

Extremely rare

For collectors

## Quality Criteria Collector's quality criteria do not apply to czochralskiite. This mineral is not available on the collector's market and does not form macroscopic specimens. Its value is purely scientific, and the only existing samples are in research institutions. ## Popular Localities There are no localities from which specimens of this mineral could be obtained. The only source is the unique material from the NWA 856 meteorite.

Care and storage

## Cleaning Not applicable. The mineral occurs exclusively as microscopic grains within the meteorite structure and is not extracted as separate specimens that would require cleaning. ## What to Avoid Not applicable. Research material is stored under stable laboratory conditions. ## Storage Fragments of the meteorite containing czochralskiite are stored in specialized scientific collections, protected from contamination and environmental changes.

Sources

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