Mitrofanovite

Chemical formula: Pt₃Te₄

Mitrofanovite is a rare platinum telluride, forming tiny, metallic grains in platinum-group element deposits.

## Characteristics Mitrofanovite is a very rare mineral from the telluride group. It occurs as very small, anhedral (not exhibiting its own crystal form) grains, usually not exceeding 100 micrometers in size. These grains are most often intergrown with other minerals, mainly chalcopyrite and other sulfides. When observed in reflected light, it has a creamy-white color with a pinkish tint. ## Physical Properties Due to the extremely small size of the grains, most physical properties, such as hardness, density, luster, or transparency, have not been precisely determined. The mineral is opaque and exhibits a metallic luster. The density calculated based on the chemical formula and unit cell parameters is approximately 11.25 g/cm³. ## Colors and Varieties The mineral has a constant chemical composition and does not form colored varieties. Its color in reflected light is characteristic, creamy-white with a pinkish tint. ## History and Name The mineral is named in honor of Felix Petrovich Mitrofanov (born 1935), a Russian geologist and director of the Geological Institute of the Russian Academy of Sciences on the Kola Peninsula. Mitrofanovite was approved as a new mineral by the International Mineralogical Association (IMA) in 2004 (IMA2004-013). It was described based on material from the Fedorovo-Pansky massif on the Kola Peninsula, Russia. ## Applications Mitrofanovite has no industrial applications. Its significance is purely scientific and collectible, as a very rare component of platinum-group element deposits.

Properties

Luster: Metallic
Streak: Gray
Density: 11.25
Cleavage: along [001]
Transparency: Opaque
Crystal system: Trigonal

Diagnostic features

## Identification Identification of mitrofanovite is possible only with advanced laboratory techniques. It requires analysis in reflected light (ore microscopy) and confirmation of chemical composition by electron microprobe (EDS/WDS). Its characteristic creamy-white color with a pinkish tint in reflected light is distinctive. ## Distinguishing from Similar Minerals It can be confused with other platinum and palladium tellurides, such as moncheite (PtTe₂) or merenskyite (PdTe₂). Definitive differentiation requires quantitative chemical analysis, as these minerals often form intergrowths and solid solutions with each other. ## Crystal Forms Mitrofanovite exclusively forms anhedral, irregular grains. It has not been observed in the form of well-developed crystals.

Geological environment

## Genesis Mitrofanovite forms during magmatic processes within layered mafic and ultramafic intrusions. It crystallizes in the late stage from residual, platinum-group element (PGE) and tellurium-rich sulfide melts. ## Mineral Associations This mineral co-occurs with other platinum-group minerals and sulfides. It is most commonly associated with: chalcopyrite, pentlandite, kotulskite, moncheite, merenskyite, sobolevskite, sperrylite, and stibiopalladinite. ## Localities The most important and only confirmed occurrences of mitrofanovite worldwide are: - Fedorovo-Pansky massif on the Kola Peninsula, Russia (type locality). - Duluth Complex in Minnesota, USA. - Sudbury Complex in Ontario, Canada.

Rarity

Extremely rare

For collectors

## Quality Criteria As a microscopic mineral, the collectible value of a mitrofanovite specimen primarily depends on its presence being confirmed by a reputable laboratory. The most valuable specimens are those from the type locality (Kola Peninsula) with the largest possible (though still microscopic) and well-defined grains, with a precisely documented list of associated minerals. The richness of the association with other rare tellurides and platinum-group minerals increases its value. ## Popular Localities Specimens come exclusively from a few specialized localities, with those from the type locality in Russia being the most prized.

Care and storage

## Cleaning Specimens with microscopic mitrofanovite grains, most often intergrown in the host rock, do not require specialized cleaning. If necessary, they can be rinsed with distilled water and dried with compressed air or left to air dry. ## What to Avoid Avoid contact with strong acids and other chemicals that could damage both the mineral itself and associated minerals. Due to its occurrence as inclusions, properties such as sensitivity to light or temperature are not critical, but standard caution is recommended. ## Storage Microscopic specimens are best stored in specialized "micromount" boxes, protecting them from dust and mechanical damage. A label with precise locality information is crucial for scientific and collectible value.

External references

https://www.mindat.org/min-52901.html