Alsakharovite-Zn

Chemical formula: NaSrKZn<sup>2+</sup>(Ti<sup>4+</sup>,Nb<sup>5+</sup>)<sub>4</sub>(Si<sub>4</sub>O<sub>12</sub>)<sub>2</sub>(O,OH)<sub>4</sub>·7H<sub>2</sub>O

A rare cyclosilicate from the labuntsovite group, distinguished by its unique chemical composition with zinc, strontium, and titanium.

## Characteristics Alsakharovite-Zn is a very rare mineral belonging to the labuntsovite group. It is a complex, hydrated silicate of sodium, strontium, potassium, zinc, titanium, and niobium. It occurs as small, tabular or bladed crystals, often forming radial or spherulitic aggregates. Typically, its size does not exceed a few millimeters, classifying it as a typical micromount mineral. It is valued by advanced collectors and scientific institutions due to its rarity and complex crystal structure. ## Physical Properties The Mohs hardness of alsakharovite-Zn is approximately 5. It exhibits a vitreous luster. It is translucent, and in thin fragments, it can be transparent. Its calculated density is approximately 2.95 g/cm³. ## Colors and Varieties This mineral ranges in color from pale yellow to yellowish-brown. No distinct color varieties or commercial forms are recognized. ## History and Name The mineral is named in honor of Andrei Sakharov (1921–1989), a prominent Russian nuclear physicist, dissident, and Nobel Peace Prize laureate. The "-Zn" suffix in the name indicates the dominance of zinc in a specific position within the crystal structure. The mineral was officially recognized by the International Mineralogical Association (IMA) in 2003. Its discovery was made in the Lovozero Massif on the Kola Peninsula in Russia. ## Applications Alsakharovite-Zn has no industrial applications. Its significance is purely scientific and as a collector's item.

Properties

Mohs hardness
5
Luster
Vitreous
Streak
White
Density
2.95
Cleavage
Good on {010}
Fracture
Uneven
Transparency
Translucent to transparent
Crystal system
Monoclinic

Diagnostic features

## Identification Identifying alsakharovite-Zn is extremely difficult without advanced analytical methods. Preliminary identification is based on its characteristic occurrence (pegmatites of the Lovozero Massif), specific associated minerals, pale yellow color, and radial aggregates. Final confirmation requires chemical analysis (e.g., EDS) to confirm the presence of zinc, strontium, titanium, and niobium, and X-ray diffraction (XRD) to confirm the structure. ## Distinguishing from Similar Minerals Alsakharovite-Zn can be confused with other minerals from the labuntsovite group, such as organovaite-Mn or gutkovaite-Mn, which have a similar appearance and occur in the same environment. However, they differ in the dominant element in specific structural positions, which can only be verified by chemical analysis. ## Crystal Forms It forms small, tabular or bladed crystals, usually grouped into radial, stellate, or spherulitic aggregates. Single, well-formed crystals are rarely observed.

Geological environment

## Genesis Alsakharovite-Zn is a hydrothermal mineral. It forms in the late stages of crystallization in highly alkaline (hyperagpaitic) pegmatites associated with nepheline syenite massifs. It crystallizes in cavities and fractures within these rocks. ## Mineral Associations This mineral co-occurs with many other rare minerals typical of the Lovozero Massif pegmatites. The most common associations include aegirine, microcline, nepheline, lomonosovite, vuonnemite, natrosilite, kazakovite, and villiaumite. ## Localities The only confirmed and most important locality for alsakharovite-Zn in the world is its type locality – the Karnasurt mine in the Lovozero Massif, on the Kola Peninsula in the Murmansk Oblast, Russia.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of collector specimens of alsakharovite-Zn, being a micromount mineral, is assessed based on several criteria. The most important is the abundance and distinctness of crystal aggregates on the rock matrix. Specimens with well-formed, radial clusters of intense yellow color are more highly valued. The presence of rare and aesthetically pleasing associated minerals also enhances its appeal. ## Popular Localities All alsakharovite-Zn specimens available on the collector's market come from a single location in the world: the Karnasurt mine in the Lovozero Massif, Russia. This is the only locality where this mineral has been found in quantities sufficient for specimen acquisition.

Care and storage

## Cleaning Specimens should be cleaned with utmost care, preferably using a soft brush or a stream of compressed air to remove dust. Ultrasonic cleaners should be avoided, as they can damage delicate crystals. Contact with water should be minimized; if necessary, use distilled water and dry the specimen quickly. ## What to Avoid The mineral is sensitive to high temperatures, which can lead to dehydration and destruction of its structure. Contact with strong acids and bases should be avoided. Due to its relatively low hardness and good cleavage, it is susceptible to mechanical damage. ## Storage It is recommended to store specimens under stable conditions, away from direct sunlight and heat sources. The safest method is to keep them in sealed "micromount" boxes, which protect against dust, humidity, and physical damage.

External references

Sources

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