Lednevite

Chemical formula: Cu<sup>2+</sup>[PO<sub>3</sub>(OH)]·H<sub>2</sub>O

Lednevite is a very rare hydrated acidic copper phosphate, forming microscopic, blue, platy crystals.

## Characteristics Lednevite is a mineral from the phosphate group, chemically classified as a hydrated acidic copper phosphate. It occurs as very small, platy or bladed crystals, rarely exceeding 0.2 mm in length. These crystals are transparent and characterized by an intense, blue color and a vitreous luster. They typically form small, radial or chaotically arranged aggregates on the surface of the host rock. ## Physical Properties Due to the microscopic size of the crystals, many of lednevite's physical properties have not been precisely determined. Its hardness is too low to scratch calcite. The density calculated based on the chemical formula and unit cell parameters is 3.21 g/cm³. The mineral exhibits perfect cleavage in one direction. ## Colors and Varieties Lednevite occurs in a uniform, light, blue color. No color varieties or commercial varieties are known. ## History and Name The mineral was approved by the International Mineralogical Association (IMA) in 2023 under the number IMA2023-085. Its name honors the Russian mineralogist and crystallographer, Dr. Ivan Lednev. It was discovered in volcanic exhalation products (fumaroles) at Tolbachik volcano in Kamchatka, Russia. ## Applications Lednevite has no industrial or commercial applications. Its significance is purely scientific and as a collector's item, as a unique and newly discovered mineral species.

Properties

Mohs hardness
1.5-2
Luster
Vitreous
Streak
Light blue
Density
3.21
Cleavage
Perfect on {100}
Fracture
Uneven
Transparency
Transparent
Crystal system
Monoclinic

Diagnostic features

## Identification Amateur identification of lednevite is practically impossible. It requires advanced analytical methods, such as Raman spectroscopy or X-ray diffraction (XRD). Visual characteristics that might only suggest its presence are microscopic, blue, platy crystals in a paragenesis typical of Tolbachik volcano fumaroles. ## Distinguishing from Similar Minerals Lednevite can be visually indistinguishable from other secondary, microscopic copper minerals found in the same environment, such as cyanotrichite, chalcanthite, or other rare phosphates and sulfates. Definitive differentiation is only possible based on chemical and structural analysis. ## Crystal Forms Lednevite crystals have a thin-platy or bladed habit. They form small, loose aggregates, often radial in nature, growing on porous volcanic rock.

Geological environment

## Genesis Lednevite is a mineral of volcanic origin, crystallizing directly from volcanic gases in active fumarole zones. It forms as a result of the reaction of hot vapors containing phosphorus and copper compounds with atmospheric oxygen at temperatures of approximately 150-250°C. It is a typical exhalative mineral. ## Mineral Associations This mineral co-occurs with other rare fumarole products of Tolbachik volcano. Its direct associations include, among others, alekseyevite, alarsite, atlasovite, avdoninite, eriochalcite, florenskyite, lammerite, piipite, tenorite, and hematite. ## Localities The only confirmed locality of lednevite in the world is its type locality – the Yadovitaya fumarole on the second eruptive cone of the northern breach of the Great Fissure Eruption of Tolbachik volcano in Kamchatka, Russia.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of lednevite specimens is primarily assessed based on the richness and aesthetics of the crystal aggregates on the rock matrix. Specimens with clearly visible, well-formed, intensely blue crystals forming visually attractive groups are most highly valued. Due to the microscopic nature of the mineral, the quality of observation under magnification is crucial. ## Popular Localities The only source of lednevite specimens is its discovery site at Tolbachik volcano in Kamchatka. Material from this locality is extremely rare and available almost exclusively in specialized circles, among collectors of microscopic minerals ("micromounts").

Care and storage

## Cleaning Lednevite specimens are extremely delicate and susceptible to mechanical damage. Cleaning is not recommended. If absolutely necessary, compressed air can be used from a safe distance to remove loose dust particles. Any contact with water or other liquids should be avoided. ## What to Avoid Contact with water, chemicals (including acids and bases), ultrasound, and sudden temperature changes must be strictly avoided. The mineral is likely sensitive to moisture and may dehydrate or undergo chemical alteration under unstable conditions. ## Storage It is recommended to store specimens exclusively in specialized, airtight "micromount" boxes, protecting them from dust, moisture, and physical damage. Exposure should be away from direct sunlight and heat sources.

Sources

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