Phosphovanadylite-Ba

Chemical formula: BaV⁴⁺₄P₂O₁₀(OH)₆·12H₂O

Phosphovanadylite-Ba is a very rare secondary mineral, forming microscopic, platy crystals of an intense blue-green color.

## Characteristics Phosphovanadylite-Ba is a hydrated vanadium and barium phosphate, belonging to the phosphovanadylite group. It occurs as very small, thin, platy crystals, rarely exceeding 0.2 mm. These crystals form rosette-like or spherical aggregates, as well as coatings and crusts on host rocks. Due to its size, the mineral's features are most often observed under a microscope. ## Physical Properties The crystals exhibit a vitreous luster. They are very brittle and soft, with a Mohs hardness of approximately 2. The calculated density is 2.59 g/cm³. The mineral is translucent. ## Colors and Varieties Phosphovanadylite-Ba is characterized by a vivid blue-green color. The streak is pale green. No varieties of this mineral are distinguished. ## History and Name The mineral was first described in 2012 by Anthony R. Kampf and his team. The name refers to its chemical composition – the presence of phosphorus (phospho-), vanadium (-vanadyl-), and dominant barium (-Ba) in a specific structural position. It was approved by the International Mineralogical Association (IMA) under number 2011-063. The type locality is the Blue Streak uranium mine in San Juan County, Utah, USA. ## Uses Phosphovanadylite-Ba has no industrial applications. Its significance is purely scientific and as a collector's item, being a very rare and recently discovered mineral species.

Properties

Mohs hardness
2
Color
Light green-blue
Luster
Vitreous
Streak
Very pale greenish blue
Density
2.16
Cleavage
Perfect on {0001}
Fracture
Micaceous
Transparency
Transparent
Crystal system
Isometric

Diagnostic features

## Identification Identification of phosphovanadylite-Ba is based on its characteristic, vivid blue-green color, its occurrence as small, rosette-like aggregates of platy crystals, and its geological environment. Due to its microscopic size, field identification is practically impossible and requires laboratory analysis. ## Distinguishing from Similar Minerals This mineral can be confused with other secondary vanadium minerals of similar color, such as shcherbinaite, minasragrite, or other minerals from the phosphovanadylite group. Definitive differentiation is almost exclusively possible using advanced analytical methods, such as Raman spectroscopy or chemical analysis (EDS). ## Crystal Forms Crystals are very thin, platy, with a hexagonal outline. They usually form rosette-like or spherulitic aggregates, as well as thin coatings on rock surfaces.

Geological environment

## Genesis Phosphovanadylite-Ba is a secondary mineral, forming in the oxidation zones of uranium-vanadium deposits in sedimentary rocks (sandstones). It forms as a result of the weathering of primary vanadium minerals in the presence of barium and phosphorus. ## Mineral Associations This mineral co-occurs with other secondary uranium and vanadium minerals. At the type locality (Blue Streak mine, Utah), it was found in association with gypsum, shcherbinaite, minasragrite, pascoite, and quartz. ## Localities The only confirmed and described occurrence of phosphovanadylite-Ba in the world is its type locality: Blue Streak mine, Bull Canyon, Uravan District, San Juan County, Utah, USA.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of collector specimens depends on the richness and aesthetics of the crystal aggregates on the rock matrix. The most prized specimens are those with clearly formed, undamaged rosettes of intense blue-green color, contrasting with the substrate. Due to the microscopic nature of the mineral, the quality of the specimen when viewed under magnification is crucial. ## Popular Localities The only source of specimens is the Blue Streak mine in Utah, USA. Material from this locality is extremely rare and sought after by collectors specializing in rare minerals and "micromounts."

Care and storage

## Cleaning Specimens should be handled with the utmost care. Cleaning is not recommended due to the extreme brittleness and small size of the crystals. If absolutely necessary, compressed air can be used from a safe distance to remove loose dust particles. ## What to Avoid Avoid contact with water, chemicals, ultrasound, and all forms of mechanical cleaning (brushes, cloths). The crystals are very soft and brittle, susceptible to mechanical damage. Protect them from changes in temperature and humidity. ## Storage It is recommended to store specimens exclusively in specialized, sealed "micromount" boxes that protect against dust, shocks, and physical contact. Display should be in stable conditions, away from sources of vibration and direct sunlight.

External references

Sources

Read more