Nasledovite

Chemical formula: Pb₂+Mn₂+₃Al₄O₅(CO₃)₄(S₆+O₄)·₅H₂O

Nasledovite is an extremely rare, complex hydrated sulfate and carbonate of lead, manganese, and aluminum, forming tiny, tabular crystals.

## Characteristics Nasledovite is a mineral with a very complex chemical composition, belonging to the sulfate and carbonate groups. It occurs as very small, tabular or bladed crystals, rarely exceeding 0.2 mm in length. These crystals form rosette-like or radial aggregates, as well as thin veins and crusts. Due to the small size of the crystals, its visual characteristics are difficult to assess without a microscope. ## Physical Properties Nasledovite crystals exhibit a vitreous luster. The mineral is soft, with a Mohs hardness of 2. It is transparent to translucent. The density calculated from the chemical formula and unit cell parameters is 3.11 g/cm³. ## Colors and Varieties Nasledovite is colorless to white, with a white streak. No varieties have been distinguished. ## History and Name This mineral was discovered in the Kurusay-1 polymetallic deposit in the Kurama Mountains, northern Tajikistan. It was approved by the International Mineralogical Association (IMA) in 2004 under number 2004-031. The name honors Boris Nikolaevich Nasledov (1885–1942), a Russian geologist who studied deposits in Central Asia. ## Uses Nasledovite has no industrial applications. It is of interest only to advanced collectors specializing in rare minerals and to scientific institutions.

Properties

Mohs hardness: 2
Luster: Vitreous
Streak: White
Density: 3.11
Cleavage: Perfect on {100}
Fracture: Uneven
Transparency: Transparent to translucent
Crystal system: Monoclinic

Diagnostic features

## Identification Identification of nasledovite is possible only through advanced analytical methods, such as X-ray diffraction (XRD) and chemical analysis (e.g., electron microprobe). Recognition in collector or field conditions is impossible. Its unique chemical composition, combining lead, manganese, aluminum, carbonate, and sulfate groups, is characteristic. ## Distinguishing from Similar Minerals Due to its appearance (tiny, white crystals), it can be confused with many other secondary sulfate or carbonate minerals. Definitive distinction requires specialized laboratory equipment. ## Crystal Forms It forms very small, thin, tabular crystals with an elongated, bladed shape. These crystals often combine into radial or rosette-like aggregates.

Geological environment

## Genesis Nasledovite is a secondary mineral, formed in the oxidation zone (gossan) of polymetallic deposits. Its formation is a result of the weathering of primary ore minerals (containing lead and manganese) in the presence of carbonate rocks and sulfides. ## Mineral Associations At the type locality (Kurusay-1), it occurs in association with minerals such as quartz, calcite, gypsum, anglesite, cerussite, dundasite, hemimorphite, pyromorphite, goethite, and manganese oxides. ## Localities The only confirmed occurrence of nasledovite in the world is the Kurusay-1 deposit, located in the Kurama Mountains, Sughd Province, Tajikistan.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of nasledovite specimens is primarily assessed based on the richness and visibility of crystal aggregates on the rock matrix. Since the crystals are microscopic, the most valuable specimens are those where the aggregates are clearly formed and cover a significant area. Contrast with the color of the host rock also enhances visual appeal. ## Popular Localities The only source of specimens is the type locality – the Kurusay-1 deposit in Tajikistan. All specimens available on the collector's market originate from this single location.

Care and storage

## Cleaning Due to its extreme rarity, small crystal size, and delicacy, nasledovite specimens should not be cleaned mechanically or chemically. Any attempts at cleaning may irreversibly damage the specimen. It is best to leave it in its untouched state. ## What to Avoid Avoid contact with any water, acids, bases, and other chemicals. The mineral is very soft and susceptible to mechanical damage, so avoid touching, vibrations, and sudden temperature changes. ## Storage Specimens should be stored only in specialized, sealed "micromount" boxes, protecting them from dust, moisture, and mechanical damage. Store in stable conditions, away from light and heat sources.

Sources

IMA Mineral List (CNMNC)