Hydrokenomicrolite

Q: Where does this mineral come from Hydrokenomicrolite?

## Genesis Hydrokenomicrolite is a mineral of magmatic origin, crystallizing in the late stages of granitic pegmatite evolution, particularly in zones rich in lithium, tantalum, and fluorine (LCT-type pegmatites). ## Mineral Associations This mineral co-occurs with other minerals typical of granitic pegmatites, such as quartz, albite, microcline, muscovite, lepidolite, elbaite, as well as with oth

Q: How to care for Hydrokenomicrolite?

## Cleaning Specimens should only be cleaned with compressed air to remove dust. Due to the microscopic size of the crystals, any other method (water, brushes) risks their irreversible loss. ## What to Avoid Avoid contact with chemicals, ultrasound, and any mechanical cleaning methods. Do not heat the specimen, as this can lead to dehydration and changes in the mineral's structure. ## Storage Hydrokenomicrolite specimens, as typical "microminerals," should be stored in specialized, sealed "micro

Chemical formula: (&#₉₇₂₃;,H₂O)₂Ta⁵⁺₂(O,OH)₆·H₂O

Hydrokenomicrolite is a rare tantalum oxide from the microlite group, occurring as microscopic, octahedral crystals in granitic pegmatites.

## Characteristics Hydrokenomicrolite is a mineral from the microlite group, belonging to the pyrochlore supergroup. Chemically, it is a hydrated tantalum oxide. It forms very small, isometric crystals, most often octahedral in habit, less frequently rhombic dodecahedral. Due to their microscopic size, rarely exceeding 0.5 mm, visual features are difficult to observe without magnification. It usually occurs as single, scattered crystals embedded in the host rock. ## Physical Properties Crystals exhibit a vitreous luster. Hardness on the Mohs scale is approximately 5, and density is high, estimated at 5.24 g/cm³. The mineral is brittle and shows a conchoidal to uneven fracture. No cleavage has been observed. ## Colors and Varieties Hydrokenomicrolite is typically colorless, white, grayish, or pale yellow. It is transparent to translucent. No named varieties of this mineral are distinguished. ## History and Name The name "hydrokenomicrolite" refers to its chemical composition and structure. The prefix "hydro" indicates the presence of water (H₂O), "keno" refers to a vacancy (empty site) at the A position in the crystal structure, and "microlite" to its belonging to the microlite group. The mineral was formally described and approved by the International Mineralogical Association (IMA) in 2011. ## Uses Due to its extreme rarity and microscopic crystal sizes, hydrokenomicrolite has no industrial applications. It is solely an object of scientific and collecting interest for specialists accumulating minerals from the pyrochlore group or "microminerals".

Properties

Mohs hardness: 5
Color: Pinkish brown
Luster: Vitreous
Streak: White
Density: 6.666
Cleavage: None
Fracture: Conchoidal
Transparency: Translucent
Crystal system: Isometric

Diagnostic features

## Identification Identification of hydrokenomicrolite is impossible without advanced analytical techniques. Preliminary identification in the field or collection relies on finding microscopic, isometric (most often octahedral) crystals with a vitreous luster within granitic lithium pegmatites. Final confirmation requires chemical analysis (EDS/WDS) and structural analysis (XRD). ## Distinguishing from Similar Minerals It can be confused with other minerals from the microlite group (e.g., microlite, fluoronatromicrolite) or other small, light-colored pegmatite minerals. Differences are based solely on chemical composition, which is impossible to assess visually. It is distinguished from quartz or albite by its significantly higher density and crystal form. ## Crystal Forms Crystals are always very small (usually < 0.5 mm) and have an isometric habit. The most common form is the octahedron {111}, sometimes in combination with the rhombic dodecahedron {110}.

Geological environment

## Genesis Hydrokenomicrolite is a mineral of magmatic origin, crystallizing in the late stages of granitic pegmatite evolution, particularly in zones rich in lithium, tantalum, and fluorine (LCT-type pegmatites). ## Mineral Associations This mineral co-occurs with other minerals typical of granitic pegmatites, such as quartz, albite, microcline, muscovite, lepidolite, elbaite, as well as with other tantalum and niobium oxides, e.g., minerals from the pyrochlore and columbite groups. ## Localities The most important and best-documented occurrences, including the type locality, are in the Czech Republic, in pegmatites in the Vysočina Region, e.g., in the localities of Laštovičky and Věžná. It has also been reported from other pegmatite localities worldwide but remains an extremely rare mineral.

Rarity

Very rare

For collectors

## Quality Criteria The collecting appeal of a specimen primarily depends on the quality and size of the crystals, although these rarely reach sizes visible to the naked eye. The most prized specimens are sharp, well-formed, undamaged octahedra, ideally contrasting with the color of the host rock (e.g., placed on lepidolite or cleavelandite). Precise documentation and analytical confirmation of the mineral's identity are crucial. ## Popular Localities Specimens from localities in the Czech Republic (Věžná, Laštovičky), which have provided the best-studied and most attractive microcrystals of this mineral, are by far the most sought after by specialist collectors.

Care and storage

## Cleaning Specimens should only be cleaned with compressed air to remove dust. Due to the microscopic size of the crystals, any other method (water, brushes) risks their irreversible loss. ## What to Avoid Avoid contact with chemicals, ultrasound, and any mechanical cleaning methods. Do not heat the specimen, as this can lead to dehydration and changes in the mineral's structure. ## Storage Hydrokenomicrolite specimens, as typical "microminerals," should be stored in specialized, sealed "micromount" boxes that protect them from dust, shocks, and accidental loss. A label with precise locality information is crucial for the specimen's value.

External references

https://www.mindat.org/min-40361.html