Ozernovskite

Chemical formula: Fe³⁺₄(Te⁴⁺O₄)(Te⁴⁺O₃)₄(H₂O)₂·5H₂O

Ozernovskite is a very rare, hydrated iron tellurite characterized by an olive-green or yellowish-green color.

## Characteristics Ozernovskite is a mineral from the tellurite group that forms microscopic, bladed or acicular crystals, rarely exceeding 0.2 mm in length. It typically occurs as radial or tangled aggregates, as well as thin coatings and efflorescences. Its most distinctive visual feature is a vibrant, olive-green to yellowish-green coloration. ## Physical Properties This mineral is relatively soft, with a Mohs hardness of approximately 3. It is transparent and has a density of 3.812 g/cm³. Its crystals exhibit a yellowish-green luster. ## Colors and Varieties Ozernovskite occurs in shades from olive-green, through yellowish-green, to light greenish-yellow or yellow with an olive tint. No varieties have been distinguished. ## History and Name The mineral's name comes from its discovery locality – the Ozernovskoe deposit in Kamchatka, Russia. It was officially recognized by the International Mineralogical Association (IMA) in 2019. It was described by Russian mineralogists, including Igor V. Pekov. ## Applications Due to its extreme rarity and microscopic crystal size, ozernovskite has no practical applications. It is solely an object of scientific interest and a collector's item for specialized micromineral collectors.

Properties

Mohs hardness
3-0
Streak
light yellow
Density
3.812
Fracture
Irregular/Uneven
Transparency
Transparent
Crystal system
Monoclinic

Diagnostic features

## Identification Identification of ozernovskite is based on its characteristic color (olive-green to yellowish-green), mode of occurrence (radial aggregates of acicular crystals), and association with other iron tellurites. A pale yellow streak is also a diagnostic feature. Final confirmation requires advanced analytical methods, such as Raman spectroscopy or chemical analysis. ## Distinguishing from Similar Minerals It can be confused with other secondary, green iron tellurites, such as poughite, emmonsite, or mackayite. Distinguishing it from these minerals with the naked eye is practically impossible and requires specialized laboratory examinations. ## Crystal Forms It forms very small, acicular or bladed crystals that combine into radial, spherulitic, or tangled aggregates. It also occurs as thin efflorescences and coatings on other minerals.

Geological environment

## Genesis Ozernovskite is a secondary mineral that forms in the oxidation (weathering) zones of gold and tellurium deposits. It originates from the alteration of primary tellurides under conditions of low temperature and pressure, with access to oxygen and water. ## Mineral Associations This mineral co-occurs with other rare tellurites and tellurides. At its type locality, it was found in association with mackayite, emmonsite, jarosite, quartz, as well as native gold and tellurium. ## Localities The only confirmed occurrence of ozernovskite in the world is its type locality – the Ozernovskoe deposit on the Kamchatka Peninsula in Russia.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of an ozernovskite specimen is assessed based on the richness and saturation of the aggregate's color, as well as its size and the aesthetic arrangement on the matrix rock. The most desirable specimens are those with clearly formed, radial aggregates of intense, olive-green color, contrasting with the substrate. ## Popular Localities The only source of specimens is the Ozernovskoe deposit in Kamchatka. Material from this locality is extremely difficult to acquire and represents a rarity in the collector's market.

Care and storage

## Cleaning Specimens should be handled with utmost care. Cleaning is not recommended due to the mineral's fragility and reactivity. If absolutely necessary, compressed air can be used from a safe distance to remove loose dust particles. ## What to Avoid Contact with water, chemicals, and ultrasonics must be strictly avoided. The mineral is likely sensitive to changes in humidity and temperature. It should not be exposed to direct sunlight. ## Storage It is recommended to store specimens in original, sealed "micromount" containers or in closed display cases with humidity control. It should be protected from dust and mechanical damage.

External references

Sources

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