Lintisite

Chemical formula: Na₃LiTi₄+₂O₂(SiO₃)₄·₂H₂O

A lithium, sodium, and titanium silicate, forming characteristic, silky aggregates of acicular or fibrous crystals.

## Characteristics Lintisite is a rare mineral from the silicate group, chemically classified as a lithium, sodium, and titanium silicate. Its most typical form of occurrence is aggregates of fine, acicular or fibrous crystals. These aggregates often have a radial structure, forming small spherulites or spherical clusters with a silky luster, which is its most recognizable feature. Less commonly, it is found as small, prismatic crystals. ## Physical Properties This mineral is characterized by a hardness of 6 on the Mohs scale. It has a silky luster, and a vitreous luster on crystal faces. It is translucent, and in thin fragments or small crystals, it can be transparent. Its density is approximately 2.89 g/cm³. ## Colors and Varieties Lintisite is usually colorless or white. There are no distinct colored varieties or trade names, and its collector value is based solely on its rarity and the quality of its crystal habit. ## History and Name The name lintisite, approved in 1990, is an acronym derived from the main chemical components of the mineral: **Li**thium, **N**atrium (sodium), **Ti**tanium, and **Si**licium (silicon). It was first described by A.P. Khomyakov and co-workers based on material found in the Khibiny Massif on the Kola Peninsula in Russia. ## Applications Due to its extreme rarity, lintisite has no industrial applications. It is solely an object of scientific interest and a valued acquisition for advanced systematic and regional mineral collections.

Properties

Mohs hardness: 6
Luster: Silky to Vitreous
Streak: White
Density: 2.89
Cleavage: Perfect on {100} and {010}
Fracture: Splintery
Transparency: Transparent to Translucent
Crystal system: Monoclinic

Diagnostic features

## Identification The most characteristic feature of lintisite is its form of occurrence – white, silky aggregates with a radial or fibrous structure. Luster, color, and hardness are helpful in identification. However, a key indicator is its specific environment of occurrence (agpaitic pegmatites) and associated minerals. ## Distinguishing from Similar Minerals Lintisite can be confused with other white, fibrous minerals, such as pectolite, sérandite, zorite, or some zeolites (e.g., natrolite). Distinguishing it based on visual characteristics alone is very difficult and often impossible without knowing the locality. Pectolite and sérandite rarely exhibit such a strong silky luster. Final confirmation of identity requires advanced analyses, such as X-ray powder diffractometry (XRD). ## Crystal Forms Lintisite crystallizes in the monoclinic system. It most often forms acicular and fibrous aggregates, often gathered into radial spherulites or chaotic, felted clusters. Well-formed, single prismatic crystals are extremely rare and microscopic in size.

Geological environment

## Genesis Lintisite is a mineral of hydrothermal origin. It forms in the late stages of crystallization in voids and fractures of highly alkaline (agpaitic) pegmatites, associated with nepheline syenite massifs. ## Mineral Associations This mineral occurs in association with other rare alkaline minerals. Its most common associations include vinogradovite, lorenzenite, aegirine, microcline, nepheline, sodalite, eudialyte, zorite, and wadeite. ## Localities Lintisite is a very rare mineral, known from only a few localities worldwide. The most important and classic occurrences, from which the best specimens originate, are: - Khibiny Massif (Koashva Mountain and Eveslogchorr Mountain) on the Kola Peninsula in Russia (type locality). - Lovozero Massif, also on the Kola Peninsula. - Mont Saint-Hilaire in Quebec, Canada – a famous locality for rare alkaline minerals.

Rarity

Very rare

For collectors

## Quality Criteria The most highly valued lintisite specimens are those that display well-formed, spherical or radial aggregates with a distinct silky luster. The size of these aggregates and their placement on an aesthetic rock matrix, preferably accompanied by other rare, well-formed minerals, are important. Specimens should be free from mechanical damage, which can easily destroy delicate, fibrous structures. ## Popular Localities By far the most sought-after specimens by collectors come from two classic localities for alkaline minerals: the Khibiny and Lovozero Massifs on the Kola Peninsula in Russia. Material from Mont Saint-Hilaire in Canada is also highly prized, although it often occurs as microscopic clusters.

Care and storage

## Cleaning Lintisite specimens should be cleaned very carefully, preferably dry, using a soft brush to remove dust. If necessary, compressed air can be used from a safe distance. Brief rinsing in distilled water is permissible, followed by thorough drying. ## What to Avoid The mineral is susceptible to mechanical damage due to its fibrous structure and perfect cleavage. Ultrasonic cleaners, strong detergents, acids, and solvents should be avoided. It should not be heated or exposed to rapid temperature changes. ## Storage Collector specimens of lintisite, especially delicate aggregates, should be stored in separate, padded boxes (micromount type) to protect them from shocks, vibrations, and contact with harder minerals. They should be protected from dust, which can be difficult to remove from fibrous clusters.

Sources

IMA Mineral List (CNMNC)