Vladimirivanovite

Chemical formula: Na₆Ca₂[Al₆Si₆O₂₄](S₆+O₄,(S₃)₂-,(S₂)₂-,Cl)₂·H₂O

Vladimirovanovite is a very rare, blue mineral from the sodalite group, closely related to lazurite, found in the Pamir Mountains.

## Characteristics Vladimirovanovite is a complex sodium and calcium aluminosilicate belonging to the sodalite group. This mineral forms granular aggregates or occurs as irregular grains, usually not exceeding 1-2 mm in size, embedded in a calcite-dolomite rock. Its most characteristic feature is an intensely blue color, very similar to the color of lazurite, to which it is closely related and often co-occurs. ## Physical Properties The mineral is characterized by a Mohs hardness of 5-5.5. It has a vitreous luster and is translucent. Its density is slightly lower than that of similar minerals from the sodalite group, approximately 2.41 g/cm³. ## Colors and Varieties The dominant and only known color of vladimirovanovite is an intense, deep blue, comparable to the color of lazurite. No color or commercial varieties have been identified. ## History and Name The mineral is named in honor of Vladimir Ivanov (1950-2006), a Russian mineralogist and geochemist from the Vernadsky Institute of Geochemistry in Moscow, who made significant contributions to the study of lazurite deposits in the Baikal and Pamir regions. It was officially recognized as a new mineral species by the International Mineralogical Association (IMA) in 2009 (IMA2009-033). ## Applications Vladimirovanovite has no industrial application. Its significance is purely scientific and as a collector's item due to its extreme rarity and occurrence in a classic lazurite locality.

Properties

Mohs hardness: 5-5.5
Luster: Vitreous
Streak: Light blue
Density: 2.41
Cleavage: None
Fracture: Uneven
Transparency: Translucent
Crystal system: Isometric

Diagnostic features

## Identification Identifying vladimirovanovite is extremely difficult without advanced analytical methods. Visually, it is practically indistinguishable from lazurite. Identification requires specialized tests, such as Raman spectroscopy or chemical analysis using an electron microprobe (EDS/WDS). ## Distinguishing from Similar Minerals This mineral is most often confused with lazurite, haüyne, and nosean. It differs from lazurite by subtle optical and chemical properties, including lower density and specific chemical composition. Unlike lazurite, vladimirovanovite contains trisulfide (S₃)²⁻ groups, which is a key diagnostic feature detectable by spectroscopic methods. ## Crystal Forms Vladimirovanovite does not form well-developed crystals. It occurs as anhedral (irregularly shaped) grains and granular aggregates within the host rock.

Geological environment

## Genesis Vladimirovanovite forms as a result of contact metasomatism processes. It crystallizes in calcite-dolomite marbles at the contact with alkaline igneous intrusions, such as syenites. Its formation conditions are very similar to those for lazurite. ## Mineral Associations This mineral co-occurs with lazurite, calcite, dolomite, diopside, phlogopite, afghanite, and pyrite. ## Localities The only confirmed occurrence of vladimirovanovite in the world is its type locality: the Lyadzhvar-Dara (Lajur Dara) lazurite deposit in the Pamir Mountains of Tajikistan.

Rarity

Extremely rare

For collectors

## Quality Criteria As a mineral primarily of micromount significance, the most prized specimens are those where vladimirovanovite forms rich, intensely blue aggregates, clearly visible against the light host rock (marble). The contrast with co-occurring golden pyrite also enhances visual appeal. However, certainty of identification is crucial, which almost always requires accompanying analytical results. ## Popular Localities The only source of specimens is the historic Lyadzhvar-Dara lazurite deposit in Tajikistan, known for supplying the world's most beautiful lazurite specimens since antiquity.

Care and storage

## Cleaning It is recommended to clean only with a soft, dry brush to remove dust. Avoid contact with water and any chemical agents, as the mineral may be sensitive to them. ## What to Avoid Avoid ultrasonic cleaners, chemical agents, acids, and sudden temperature changes. Due to its chemical composition, contact with moisture can lead to slow chemical changes on the specimen's surface. ## Storage Specimens should be stored under stable conditions, in a dry place, away from direct sunlight. It is best to keep them in closed collector's boxes or display cases to protect them from dust and mechanical damage.

Sources

IMA Mineral List (CNMNC)