Kyanoxalite

Chemical formula: Na₇(Al₅-₆Si₆-₇O₂₄)((C₂)₆+O₄)₀.₅-₁.₀·₅H₂O

Kyanoxalite is an extremely rare, hydrated sodium aluminosilicate with an oxalate group, forming blue, prismatic crystals.

## Characteristics Kyanoxalite is a unique mineral from the silicate group, distinguished by the presence of an organic oxalate ion in its crystal structure. It is the only known natural aluminosilicate-oxalate. It forms elongated, prismatic crystals, reaching up to 1.5 cm in length. It usually occurs as small aggregates or single crystals grown in rock cavities. Its most characteristic feature is its attractive, blue color. ## Physical Properties This mineral is characterized by a vitreous luster and is transparent. Its hardness on the Mohs scale has not yet been precisely determined. The density calculated based on its chemical composition and unit cell parameters is approximately 2.33 g/cm³. ## Colors and Varieties Kyanoxalite most often occurs in shades of blue, from light to intensely sapphire. Colorless specimens are also found. No named varieties of this mineral have been distinguished. ## History and Name The mineral's name, approved in 2008, refers to its characteristic blue color (from the Greek word *kyanos* - "blue") and the presence of an oxalate group in its composition (*oxalite*). It was discovered and described based on material from the Dara-i-Pioz Glacier in Tajikistan. ## Uses Kyanoxalite has no industrial application. Due to its extreme rarity and unique chemical composition, it is a mineral of purely scientific and collectible significance.

Properties

Luster: Vitreous
Streak: White
Density: 2.33
Transparency: Transparent
Crystal system: Monoclinic

Diagnostic features

## Identification Key features for identifying kyanoxalite are its blue color, prismatic crystal form, vitreous luster, and unique occurrence environment. Definitive confirmation requires advanced analytical methods, such as spectroscopy or X-ray diffraction, due to its exceptional chemical composition. ## Distinguishing from Similar Minerals At first glance, kyanoxalite may be confused with other blue minerals from the same locality, such as kyanite. However, kyanite is much harder and has different physical properties. From other rare minerals from alkaline pegmatites, it is primarily distinguished by its unique combination of silicate and oxalate. ## Crystal Forms Kyanoxalite crystallizes in the form of prismatic, elongated columns. Crystals often form small, loose aggregates or occur as single individuals in rock caverns.

Geological environment

## Genesis Kyanoxalite is a hydrothermal mineral, associated with highly differentiated, alkaline (agpaitic) pegmatites. It forms in the late stage of crystallization, filling voids and fissures in the rock. ## Mineral Associations This mineral co-occurs with a number of other, often rare minerals characteristic of the Dara-i-Pioz massif. The most common associations include quartz, microcline, aegirine, and eudialyte. ## Localities The only confirmed locality of kyanoxalite in the world is its type locality - the Dara-i-Pioz Glacier in the Alay Mountains, Tajikistan. This is one of the world's most famous sites for unique alkaline minerals.

Rarity

Extremely rare

For collectors

## Quality Criteria The most highly valued kyanoxalite specimens are those with well-formed, sharply terminated crystals of intense blue color. The size of the crystals, their transparency, and the absence of damage are also important. Specimens on a rock matrix, in an aesthetic arrangement with other associated minerals, are particularly sought after by collectors. ## Popular Localities Since this mineral is known from only one place in the world, all specimens available on the collector's market come from the Dara-i-Pioz Glacier in Tajikistan. This locality is the source of the most desirable samples.

Care and storage

## Cleaning Kyanoxalite specimens should be cleaned very carefully, using a soft brush to remove dust. If necessary, they can be rinsed in distilled water and then thoroughly dried. Ultrasonic cleaners should be avoided. ## What to Avoid As a hydrated mineral, kyanoxalite can be sensitive to high temperatures, which can lead to dehydration and structural damage. It should be protected from contact with acids and other aggressive chemicals. Prolonged exposure to direct sunlight may potentially cause color fading. ## Storage It is recommended to store specimens in separate, padded boxes to avoid scratches and mechanical damage. Stable environmental conditions should be ensured, away from heat sources and sudden temperature changes.

Sources

IMA Mineral List (CNMNC)