Vanalite

Chemical formula: NaAl<sub>8</sub>V<sup>5+</sup><sub>10</sub>O<sub>38</sub>·30H<sub>2</sub>O

Wanalite is a rare vanadate mineral, forming aggregates of small, fibrous crystals with an intense yellow color.

## Characteristics Wanalite is a hydrated sodium and aluminum vanadate, occurring as aggregates of small, acicular or fibrous crystals. It typically forms crusts, coatings, or fillings within host rocks. Its most characteristic feature is its intense, canary-yellow color. ## Physical Properties Wanalite crystals are very small and delicate, which makes it difficult to accurately determine physical properties based on macroscopic observation. This mineral is characterized by a silky luster, resulting from its fibrous structure. It is translucent. Its Mohs hardness is approximately 2, and its density is 2.45 g/cm³. ## Colors and Varieties Wanalite occurs in a characteristic bright yellow or canary-yellow color. No color varieties or commercial varieties are distinguished. ## History and Name The name wanalite refers to its chemical composition – it contains vanadium and aluminum. It was first described in 1962 based on material from a uranium mine in the Kurama mountain range region of Uzbekistan. ## Uses Wanalite has no industrial application. Due to its rarity and attractive appearance, it is valued by mineral collectors.

Properties

Mohs hardness
2
Luster
Silky
Streak
Light yellow
Density
2.45
Cleavage
Perfect on {010}
Fracture
Uneven
Transparency
Translucent
Crystal system
Monoclinic

Diagnostic features

## Identification Wanalite can be identified by its characteristic canary-yellow color and its fibrous or acicular aggregate form. It typically forms crusts and coatings on other minerals, especially in the oxidation zones of uranium-vanadium deposits. ## Distinguishing from Similar Minerals Wanalite is sometimes confused with other yellow secondary vanadium minerals, such as carnotite or tyuyamunite. Distinguishing it from these minerals often requires advanced studies, such as chemical analysis (EDS) or X-ray diffraction (XRD), because carnotite and tyuyamunite are radioactive, while wanalite is not (or exhibits very weak radioactivity). ## Crystal Forms Wanalite forms aggregates of small, acicular or fibrous crystals, which can be arranged radially or chaotically. Single, well-formed crystals are rarely observed.

Geological environment

## Genesis Wanalite is a secondary mineral, forming in the oxidation zones of polymetallic deposits, especially those containing uranium and vanadium. It forms as a result of the weathering of primary vanadium minerals in the presence of aluminum- and sodium-rich solutions. It most commonly occurs in fractures and voids within carbonaceous-siliceous shales. ## Mineral Associations Wanalite often co-occurs with other vanadate and uranium minerals, such as tyuyamunite, carnotite, as well as gypsum, barite, quartz, and clay minerals. ## Localities The most important and classic localities for wanalite are in Uzbekistan, within the Kurama mountain range. It is also known from several localities in the United States, mainly in Arizona, Colorado, and Utah, where it occurs in uranium-vanadium deposits on the Colorado Plateau.

Rarity

Rare

For collectors

## Quality Criteria The most valued specimens by collectors are those with rich, well-formed aggregates of fibrous crystals with an intense, canary-yellow color. Contrast with the rock matrix and the presence of associated minerals are also important. Due to its delicacy, the condition of the specimen is crucial. ## Popular Localities The best wanalite specimens come from historical localities in Uzbekistan. Specimens from the United States, e.g., from mines in the Monticello area of Utah, are also sought after by collectors specializing in secondary minerals.

Care and storage

## Cleaning Wanalite specimens are extremely delicate and brittle. Mechanical cleaning, including the use of brushes, should be avoided. If absolutely necessary, the specimen can be carefully rinsed in distilled water and then left to air dry completely at room temperature, without the use of heat sources. ## What to Avoid Avoid contact with all chemicals, acids, and detergents. The mineral is sensitive to changes in temperature and humidity. It should not be heated or soaked for extended periods. Due to potential uranium content, avoid inhaling dust and wash hands after handling the specimen. ## Storage Wanalite specimens are best stored in closed, padded boxes or display cases to protect them from mechanical damage, dust, and sudden changes in humidity. They should be kept away from direct sunlight and heat sources.

Sources

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