Vladykinite
Chemical formula: Na₃Sr₄(Fe²⁺Fe³⁺)Si₈O₂₄
Vladykinite is a very rare sodium, strontium, and iron silicate, forming tiny, pinkish-brown grains in syenites.
Properties
- Mohs hardness
- 5
- Luster
- Vitreous to greasy
- Streak
- White
- Density
- 3.51
- Cleavage
- On {100}
- Transparency
- Transparent to translucent
- Crystal system
- Monoclinic
Diagnostic features
## Identification Identification of vladykinite is impossible without advanced analytical methods, such as X-ray microanalysis (EDS/WDS) or X-ray diffraction (XRD). Under collecting conditions, identification relies solely on trust in a label from a reliable source confirming scientific analysis. Visually, they are only very fine, pinkish-brown grains in the rock. ## Distinguishing from Similar Minerals Visually, it is indistinguishable from many other rare minerals with similar habit and color, found in alkaline massifs, such as tinaksite, charoite, or some members of the eudialyte group. Definitive differentiation requires specialized laboratory equipment. ## Crystal Forms Vladykinite forms exclusively anhedral, irregular grains and granular aggregates. No well-formed crystals have been observed.
Geological environment
## Genesis Vladykinite is a mineral of magmatic origin. It forms in the late stages of crystallization in a specific type of alkaline rock – aegirine-kalsilite syenites, rich in potassium and sodium. ## Mineral Associations This mineral coexists with other minerals typical of the Murun Massif, such as microcline, aegirine, arfvedsonite, nepheline, kalsilite, lamprophyllite, tinaksite, as well as rarer minerals like tausonite (strontium titanate). ## Localities The only confirmed occurrence of vladykinite in the world is its type locality – the Murun Massif (Tausonitovaya Gorka hill) on the Aldan Shield, at the border of the Irkutsk Oblast and Yakutia in Russia.
Rarity
Extremely rare
For collectors
## Quality Criteria The quality of a vladykinite specimen depends solely on the abundance and size of its grains within the host rock (matrix). Since the mineral is microscopic, fragments of rock where its aggregates are visible to the naked eye as distinct, pinkish-brown spots are most valued. Co-occurrence with other rare minerals from this locality enhances its attractiveness. ## Popular Localities All material available on the collector's market comes from a single location in the world – the Murun Massif in Russia. These specimens are extremely difficult to acquire.
Care and storage
## Cleaning Specimens containing vladykinite should generally not be cleaned, as its fine grains are intergrown with the host rock. Any mechanical or chemical intervention risks damaging or completely removing them. If necessary, dust can be removed with a gentle stream of compressed air. ## What to Avoid Avoid contact with all chemicals, acids, and detergents. Do not subject the specimen to ultrasonic cleaning or steam cleaning. The mineral is brittle, so protect it from impacts and scratches. ## Storage Specimens with vladykinite are best stored in stable conditions, in a closed display box, to protect them from dust and mechanical damage. An accurate label with the location should be included, as visual identification is impossible.