Szymańskiite

Chemical formula: Hg<sup>1+</sup><sub>16</sub>Ni<sup>2+</sup><sub>6</sub>(CO<sub>3</sub>)<sub>12</sub>(OH)<sub>12</sub>(H<sub>3</sub>O)<sub>8</sub>·3H<sub>2</sub>O

Szymańskiite is an extremely rare hydrated basic nickel and mercury(I) carbonate, forming microscopic, hexagonal crystals of an intense green color.

## Characteristics Szymańskiite is a very rare mineral from the carbonate group, distinguished by its complex chemical composition containing nickel and mercury. It occurs as extremely small, hexagonal crystals with a tabular or short-prismatic habit. Individual crystals rarely exceed 0.1 mm in diameter and often form radial aggregates or rosettes. Due to its microscopic size, it is a mineral primarily accessible to specialized collectors and scientific institutions. ## Physical properties The crystals are too small to unambiguously determine their hardness, density, or other physical properties in a standard way. The luster is described as vitreous. The mineral is transparent to translucent. ## Colors and varieties Szymańskiite is characterized by a vivid, emerald-green color. No varieties are known. ## History and name The mineral was discovered in the Paradise gold and mercury mine, Humboldt County (Nevada, USA). It was described in 1991 by A.C. Roberts, J.A. Grice, and R.A. Gault. The name honors the Polish-Canadian crystallographer, Jan T. Szymański (born 1938), in recognition of his contributions to mineral crystal chemistry. ## Uses Szymańskiite has no industrial applications. Its significance is purely scientific and for collectors.

Properties

Mohs hardness
2.5-3
Luster
Vitreous
Streak
Light green
Density
6.55
Cleavage
Perfect on {0001}
Fracture
Uneven
Transparency
Transparent to translucent
Crystal system
Trigonal

Diagnostic features

## Identification Identification of szymańskiite is possible almost exclusively using advanced analytical methods, such as X-ray diffraction (XRD) and chemical microanalysis (EDS/WDS). Visually, in the field or in a collection, it can be suspected based on its characteristic emerald-green color, the form of small hexagonal crystals, and its co-occurrence with other rare mercury minerals in a specific geological environment. ## Distinguishing from similar minerals It can be confused with other secondary, green nickel or copper minerals, such as annabergite, zaratite, malachite, or agardite. Differentiation requires specialized equipment. Szymańskiite is distinguished by its hexagonal crystal form and unique chemical composition. ## Crystal forms It forms microscopic, hexagonal crystals with a tabular or short-prismatic habit. Crystals often combine into radial aggregates, rosettes, or form thin coatings on the host rock.

Geological environment

## Genesis Szymańskiite is a secondary mineral, formed in the oxidation (weathering) zone of hydrothermal deposits rich in mercury and nickel. It forms as a result of the alteration of earlier ore minerals under low temperature and pressure conditions, in the presence of carbonate-rich waters. ## Mineral associations At the type locality (Paradise mine), it co-occurs with native mercury, cinnabar, calomel, eglestonite, moschelite, terlinguaite, zaratite, as well as opal and quartz. ## Localities The only confirmed and thoroughly described occurrence of szymańskiite in the world is its type locality: the Paradise mine, in the Paradise Valley area, Humboldt County, Nevada, USA.

Rarity

Extremely rare

For collectors

## Quality criteria The quality of szymańskiite specimens is primarily assessed based on the richness and aesthetics of the microscopic crystals on the matrix. Most valued are specimens with well-formed, undamaged, intensely green crystals forming dense clusters or visually attractive rosettes. The color contrast with lighter host rock also enhances aesthetic value. Due to its extreme rarity, any authentic specimen is considered valuable. ## Popular localities The only source of specimens is the Paradise mine in Nevada, USA. Material from this locality is extremely difficult to acquire and appears on the collector's market sporadically.

Care and storage

## Cleaning Specimens of szymańskiite are extremely delicate due to the microscopic size of the crystals. Mechanical cleaning is not recommended. If absolutely necessary, compressed air can be used from a safe distance to remove loose dust. Avoid contact with water and any chemicals. ## What to avoid Ultrasonics, acids, detergents, and high temperatures must be strictly avoided. The mineral is likely sensitive to prolonged exposure to strong light and changes in humidity. Due to its mercury content, direct contact and inhalation of dust should be avoided. ## Storage Specimens should be stored only under stable conditions, in sealed "micromount" containers, protecting them from dust, shocks, and humidity changes. It is best to keep them in a dark and dry place.

Sources

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