Kanonerovite

Chemical formula: Na₃Mn₂+P₃O₁₀·₁₂H₂O

Kanonerovite is a very rare, hydrated sodium manganese phosphate, forming aggregates of small, tabular crystals of white color and pearly luster.

## Characteristics Kanonerovite is a mineral from the phosphate class, chemically classified as a hydrated sodium manganese triphosphate. It occurs as aggregates of very small, thin, tabular crystals, which rarely exceed 0.5 mm in length and 0.01 mm in thickness. Individual crystals are colorless and transparent, but in aggregates, they form white, chalky or porcelain-like masses with a pearly luster. ## Physical Properties This mineral is very soft, with a Mohs hardness of just 1. The crystals exhibit perfect cleavage in one direction, which is consistent with their tabular habit. The luster observed on cleavage surfaces is distinctly pearly, while on other faces it is vitreous. It is a light mineral, with a density of approximately 1.88 g/cm³. ## Colors and Varieties Kanonerovite is usually white or colorless. No colored or commercial varieties have been distinguished. ## History and Name The mineral was discovered in a pegmatite in the Urucum manganese ore deposit in the municipality of Corumbá, Mato Grosso do Sul state, Brazil. It was approved by the International Mineralogical Association (IMA) in 1998. Its name honors Olga Vyacheslavovna Kanonerova (1916–1995), a Russian mineralogist and crystallographer from the Moscow State Geological Institute, for her contributions to the study of phosphate minerals. ## Uses Due to its extreme rarity, small crystal size, and low hardness, kanonerovite has no industrial applications. It is solely an object of scientific and collecting interest for specialized collectors of rare minerals.

Properties

Mohs hardness: 1
Luster: Pearly
Streak: White
Density: 1.88
Cleavage: Perfect on {010}
Fracture: Uneven
Transparency: Transparent
Crystal system: Triclinic

Diagnostic features

## Identification Kanonerovite can be identified by its occurrence as small, white, tabular crystals forming chalk-like or porcelain-like aggregates. Characteristic features include a strong pearly luster on cleavage surfaces, very low hardness (it can be scratched with a fingernail), and co-occurrence with other rare phosphates in alkaline pegmatites. ## Distinguishing from Similar Minerals It can be confused with other white, soft secondary minerals, such as talc or gypsum. What distinguishes it is its specific environment of occurrence (alkaline pegmatites), mineral associations (e.g., with serrabrancaite), and the characteristic pearly luster on the flat crystal surfaces. Final identification requires advanced analytical methods, such as X-ray diffraction (XRD). ## Crystal Forms It forms very thin, platy or tabular crystals, often flattened along the direction of perfect cleavage. These crystals combine into rosette-like, radial, or chaotic aggregates that macroscopically appear as white, chalky coatings or masses.

Geological environment

## Genesis Kanonerovite is a hydrothermal mineral, crystallizing in the late stage of the evolution of highly alkalized pegmatites. It forms in rock cavities and fissures as a result of the action of solutions rich in phosphorus, sodium, and manganese. Its presence indicates specific, low-temperature hydrothermal conditions in an alkaline environment. ## Mineral Associations This mineral occurs in association with other rare phosphates. At the type locality (Urucum deposit), it was found in association with quartz, aegirine, microcline, rhodochrosite, galileiite, serrabrancaite, and strunzite. It also co-occurs with unidentified manganese phosphates. ## Localities The only confirmed and described occurrence of kanonerovite in the world is its type locality – the Urucum manganese ore deposit, located in the municipality of Corumbá, Mato Grosso do Sul state, Brazil.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of kanonerovite specimens is primarily assessed based on the richness and aesthetics of the crystal aggregates. The most desirable specimens are those with clearly formed, though microscopic, rosettes or radial clusters on a contrasting rock matrix. Due to the microscopic nature of the crystals, the clarity and transparency of individual specimens are less important than the overall appearance of the aggregate. The size of the specimen with visible, rich kanonerovite clusters is a key factor influencing its value. ## Popular Localities The only source of kanonerovite specimens is its type locality in Brazil (Urucum deposit). All specimens available on the collector's market originate from this single location.

Care and storage

## Cleaning Kanonerovite specimens are extremely delicate and sensitive to water. Mechanical cleaning is highly risky. If necessary, compressed air (from a safe distance) can be used to remove loose dust particles. Any contact with water or other liquids should be avoided. ## What to Avoid Contact with water, which can dissolve or damage the mineral, must be absolutely avoided. It should be protected from high temperatures, which can lead to dehydration and destruction of the crystal structure. It is very soft, so touching, rubbing, and contact with harder minerals should be avoided. ## Storage It is recommended to store specimens in tightly sealed "micromount" containers, which protect against mechanical damage, dust, and humidity changes. Display should be away from direct sunlight and heat sources.

Sources

IMA Mineral List (CNMNC)