Zincochenite

Chemical formula: Pb<sup>2+</sup><sub>4</sub>Zn<sup>2+</sup>(OH)<sub>6</sub>(S<sup>6+</sup>O<sub>4</sub>)<sub>2</sub>

Zincochenite is a rare secondary mineral from the sulfate group, distinguished by its unique chemical composition containing lead and zinc.

## Characteristics Zincochenite is a rare, hydrated lead and zinc sulfate. It forms very small, tabular or bladed crystals, which typically occur as radial or spherulitic aggregates. Individual crystals rarely exceed 0.2 mm in length. Due to their small size, its visual features are difficult to observe without magnification. ## Physical Properties Zincochenite crystals exhibit a vitreous luster. They are transparent to translucent. Hardness and density have not been precisely determined due to the small size and rarity of the material. ## Colors and Varieties This mineral is colorless to white. No varieties have been distinguished. ## History and Name The name zincochenite refers to its chemical composition – it contains zinc (Latin: *zincum*) and is chemically related to chenite. It was approved as a new mineral by the International Mineralogical Association (IMA) in 2017. It was described by a research team, including Stuart J. Mills, based on material from the Redmond Mine in Arizona, USA. ## Uses Zincochenite has no industrial application. Its significance is purely scientific and collector-oriented, as a very rare and recently discovered mineral species.

Properties

Luster
Vitreous
Streak
White
Cleavage
Perfect on {0001}
Fracture
Uneven
Transparency
Transparent to Translucent
Crystal system
Trigonal

Diagnostic features

## Identification Identification of zincochenite is impossible without advanced analytical methods, such as Raman spectroscopy or X-ray diffraction (XRD) combined with chemical analysis (EDS). In collector conditions, identification relies on a label from a reliable source and the characteristic morphology of radial aggregates visible under a microscope. ## Distinguishing from Similar Minerals It can be confused with other secondary lead sulfates, such as anglesite, linarite, or chenite, with which it often co-occurs. Visual differentiation is practically impossible. Chenite forms similar, but often greenish or bluish crystals. Certain distinction requires specialized studies. ## Crystal Forms Zincochenite forms thin, tabular crystals with a hexagonal outline, elongated in one direction. These crystals combine into radial, stellate, or spherulitic aggregates, as well as chaotic clusters.

Geological environment

## Genesis It is a secondary mineral, forming in the oxidation zones of polymetallic deposits rich in lead and zinc. It forms in arid conditions as a result of the interaction of acidic, sulfate-rich waters with primary ore minerals, such as galena and sphalerite. ## Mineral Associations Zincochenite co-occurs with other rare secondary minerals. In the type locality (Redmond Mine), it was found in association with anglesite, chenite, linarite, sphalerite, galena, quartz, hematite, and marcasite. ## Localities The only confirmed and described occurrence of zincochenite in the world is its type locality: Redmond Mine, Hay-Hay-Mine-Group, Mohave County, Arizona, USA.

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of zincochenite specimens is assessed primarily based on the richness and development of crystalline aggregates. Specimens with distinct, radial or spherulitic clusters on a contrasting matrix are most highly valued. The size of the aggregates and the aesthetics of the composition are crucial, as individual crystals are microscopic. ## Popular Localities The only source of collector specimens is the Redmond Mine in Arizona, USA. Material from this locality is considered the reference standard for this species.

Care and storage

## Cleaning Zincochenite specimens are extremely delicate and small. Mechanical or chemical cleaning is not recommended. If necessary, compressed air can be used from a safe distance to remove loose dust particles. ## What to Avoid Avoid contact with water, acids, detergents, and any other chemicals. The mineral is likely sensitive to changes in temperature and humidity. Protect it from ultrasound and vibrations. ## Storage It is recommended to store specimens exclusively in specialized, sealed "micromount" boxes, protecting them from dust, moisture, and mechanical damage. Exposure should be away from direct sunlight and heat sources.

Sources

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