Dmitryivanovite
Chemical formula: CaAl<sub>2</sub>O<sub>4</sub>
Dmitryivanovite is an extremely rare mineral, a natural form of calcium aluminum oxide (CaAl₂O₄), found exclusively in meteorites.
Description
## Characteristics Dmitryivanovite is a calcium aluminum oxide, representing the natural analogue of the synthetic compound CaAl₂O₄. It occurs as microscopic, anhedral or partially formed grains, not exceeding 150 micrometers in size. Due to its nature, it is impossible to observe with the naked eye. It is colorless and transparent. ## Physical Properties The mineral is transparent. Its density, calculated based on chemical composition and crystal structure, is approximately 3.59 g/cm³. Other physical properties, such as hardness, luster, or fracture, have not been determined due to the microscopic size of the grains and their occurrence as inclusions in other material. ## Colors and Varieties Dmitryivanovite is colorless. No colored varieties or trade names are known. ## History and Name The mineral's name, approved by the International Mineralogical Association (IMA) in 2007, honors Dmitry Andreevich Ivanov (1962–1986), a Russian geologist and petrographer who specialized in the study of meteorites and impact craters. It was discovered in the Khatyrka chondrite meteorite, found in Russia. ## Uses Dmitryivanovite has no commercial or industrial applications. Its significance is purely scientific, providing information about processes occurring in the early Solar System.
Diagnostic features
## Identification Identification of dmitryivanovite is impossible based on visual characteristics. It requires the use of advanced laboratory techniques, such as electron microprobe analysis (EMPA) for chemical composition and electron backscatter diffraction (EBSD) to determine the crystal structure. ## Distinguishing from Similar Minerals Under the microscope, dmitryivanovite can be confused with other colorless, microscopic minerals found in calcium-aluminum-rich inclusions (CAIs) in meteorites, such as grossite, hibonite, or krotite. Definitive distinction is only possible based on precise chemical and structural analysis. ## Crystal Forms This mineral forms only microscopic grains with an anhedral (without crystal faces) or subhedral (partially formed) habit. No well-formed crystals have been observed.
Geological environment
## Genesis Dmitryivanovite is an extraterrestrial mineral. It formed under conditions of high temperature and very low pressure in the solar nebula from which the Solar System formed. It crystallized as one of the components of calcium-aluminum-rich inclusions (CAIs) within a CV3 carbonaceous chondrite. ## Mineral Associations It co-occurs with other rare meteoritic minerals, such as krotite, deltalumite, grossite, hibonite, hercynite, and perovskite. ## Localities The only confirmed locality of dmitryivanovite in the world is the Khatyrka meteorite, found in the Listvenitovyi stream in the Koryak Highlands, Russia.
Rarity
Extremely rare
Collector aspects
## Quality Criteria The collector's value of dmitryivanovite is exclusively scientific and specialized. Specimens are not evaluated for aesthetics in the traditional sense. Key criteria include confirmed identification through research, the abundance of mineral grains in the preparation, and the presence of rare associated minerals. The most valuable are fragments from the type locality (Khatyrka meteorite) with well-documented analysis. ## Popular Localities The only source of specimens is the Khatyrka meteorite from Russia, making it a material of extremely limited availability.
Care and storage
## Cleaning Dmitryivanovite specimens are most often meteorite fragments prepared as microscopic slides or micromounts. They should not be cleaned by the collector. Any intervention, especially mechanical (brushes, needles) or chemical, can irrevocably damage the delicate mineral grains. ## What to Avoid Avoid any shocks, impacts, and attempts to scratch. The specimen should be protected from contact with any chemicals and solvents. Storage in stable temperature and humidity conditions is recommended. ## Storage The safest form of storage is a dedicated micromount box, which protects the specimen from dust, vibrations, and mechanical damage. Microscopic slides (thin sections) should be stored in specialized containers.