Yusupovite

Chemical formula: Na₂Zr⁴⁺(Si₆O₁₅)·3H₂O

Yusupovite is an extremely rare zirconium-sodium mineral, found as colorless, lath-like crystals in agpaitic pegmatites.

## Characteristics Yusupovite is a hydrated sodium zirconium silicate, belonging to the leucophanite group. It forms colorless, transparent crystals with a lath-like or tabular habit, reaching sizes up to 0.5 x 0.2 x 0.05 mm. These crystals often occur in radial or chaotically arranged aggregates. The mineral is characterized by a vitreous luster. ## Physical properties Yusupovite has a Mohs hardness of 5. It is a relatively light mineral, with a density slightly above 2.6 g/cm³. It does not exhibit fluorescence under ultraviolet light. ## Colors and varieties This mineral is colorless. No colored varieties are known. ## History and name Yusupovite was discovered in the Yubileinaya pegmatite in the Lovozero Massif on the Kola Peninsula, Russia. It was approved as a new mineral species by the IMA in 2003. Its name honors the Russian geologist and mineralogist, Talgat S. Yusupov (born 1928), in recognition of his contribution to the study of the region's geology.

Properties

Mohs hardness
5
Color
colorless
Luster
Vitreous
Streak
white
Density
2.69
Cleavage
{110}
Fracture
Splintery
Transparency
Transparent
Crystal system
Monoclinic

Diagnostic features

## Identification Identification of yusupovite is practically impossible without advanced analytical techniques, such as X-ray diffraction (XRD) and chemical analysis (EDS/WDS). In field conditions or in a collection, it is indistinguishable from many other colorless, lath-like minerals. ## Distinguishing from similar minerals It can be confused with many other silicates found in the same environment, such as catapleite, elpidite, or some zeolites. Definitive differentiation requires specialized research equipment to confirm its unique chemical composition (especially the presence of zirconium and sodium in specific proportions) and crystal structure. ## Crystal forms Yusupovite forms very small, lath-like or thin-tabular crystals. They usually occur as radial or irregular clusters and aggregates, often growing on other minerals or filling small voids in the rock.

Geological environment

## Genesis Yusupovite forms in the late stages of crystallization in highly differentiated agpaitic pegmatites, which are extremely rich in alkalis (sodium, potassium) and rare elements, such as zirconium. ## Mineral associations This mineral co-occurs with other rare minerals typical of the Lovozero Massif pegmatites. Its main associations include: ussingite, lomonosovite, vuonnemite, eudialyte, villiaumite, sérandite, and zorite. ## Localities The only confirmed occurrence (type locality) of yusupovite in the world is the Yubileinaya pegmatite in the Lovozero Massif, on the Kola Peninsula in the Murmansk Oblast, Russia.

Rarity

Extremely rare

For collectors

## Quality criteria As a micromineral of extreme rarity, every analytically confirmed specimen is valuable. Most highly prized are those with well-formed, even if microscopic, crystals, clearly visible on the rock matrix. Association with other rare minerals from the same locality is also important. Due to its colorless nature, color is not a criterion for evaluation.

Care and storage

## Cleaning Due to the extreme rarity and fragility of specimens, mechanical cleaning is not recommended. Any contaminants should only be removed by specialists. If absolutely necessary, compressed air can be used from a safe distance. ## What to avoid Avoid contact with chemicals, acids, and bases. It should not be subjected to ultrasonic cleaning. Protect from high temperatures, which can cause dehydration and destruction of the crystal structure. Avoid shocks and impacts. ## Storage Yusupovite specimens should be stored under stable conditions, in specialized "micromount" boxes that protect against dust, moisture, and mechanical damage. Avoid exposure to direct sunlight, although its light sensitivity is not known.

External references

Sources

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