Korobitsynite
Chemical formula: (Na,◻)₄Ti⁴⁺₂(Si₄O₁₂)(O,OH)₂·4H₂O
Korobitsynite is a rare sodium titanium silicate, forming colorless, transparent crystals with a vitreous luster.
Properties
- Mohs hardness
- 5
- Luster
- Vitreous
- Streak
- White
- Density
- 2.72
- Cleavage
- (001)
- Fracture
- Uneven
- Transparency
- Transparent
- Crystal system
- Orthorhombic
Diagnostic features
## Identification Korobitsynite is identified by its form – thin, tabular or lath-like crystals, often forming radial aggregates. Key features include its colorlessness, transparency, vitreous luster, and occurrence in a specific geological environment, namely agpaitic pegmatites. ## Distinguishing from Similar Minerals It can be confused with other colorless silicates found in similar parageneses, such as some zeolites (e.g., natrolite) or other minerals from the nenadkevichite group. It differs from natrolite in crystal form (natrolite forms needles), and from other minerals in the group, advanced chemical analyses (EDS/WDS) are required for certain identification. ## Crystal Forms Crystals are usually thin, tabular or lath-like, with a rectangular cross-section. They often form fan-shaped, radial, or irregular aggregates. Less commonly, they are found as single, well-formed crystals.
Geological environment
## Genesis Korobitsynite is a hydrothermal mineral, crystallizing in the late stages of evolution of highly alkaline (agpaitic) nepheline syenite pegmatites. It forms in rock cavities and fissures. ## Mineral Associations This mineral co-occurs with a wide range of other rare alkaline minerals. Its typical associations include aegirine, microcline, nepheline, sodalite, eudialyte, lorenzenite, lomonosovite, murmanite, lamprophyllite, and especially shomiokite-(Y), with which it is often found. ## Localities The most important and classic localities for korobitsynite are in Russia, in the alkaline massifs of the Kola Peninsula. These are primarily Mount Karnasurt and Mount Alluaiv in the Lovozero massif (Murmansk Oblast), where the mineral was discovered. It is particularly known from the "Shomiokitovoe" pegmatite in the Umbozero mine.
Rarity
Very rare
For collectors
## Quality Criteria Specimens with well-formed, sharp, and transparent crystals, forming aesthetic, radial aggregates, are most valued by collectors. Contrast with the rock matrix and the presence of rare associated minerals are important. Due to their small size, the quality of a specimen is mainly assessed under magnification. "Micromount" specimens are the standard. ## Popular Localities By far the most sought-after specimens come from the type localities in Russia, from the Lovozero massif on the Kola Peninsula, especially from the Shomiokitovoe pegmatite on Mount Alluaiv. Specimens from these locations are considered reference material for this species.
Care and storage
## Cleaning Korobitsynite specimens should be cleaned very carefully, using a soft brush to remove dust. If necessary, distilled water can be used, but prolonged soaking should be avoided due to the mineral's hydrated structure. Ultrasonic cleaners should be avoided. ## What to Avoid Contact with acids and other aggressive chemicals should be avoided. The mineral is sensitive to high temperatures, which can lead to dehydration and structural damage. It should be protected from impacts and scratches by harder minerals. ## Storage It is recommended to store specimens in separate, padded "micromount" boxes to protect delicate crystals from mechanical damage and dust. Display should be in stable conditions, away from direct sunlight and heat sources.