Lishizhenite

Chemical formula: Zn₂+Fe₃+₂(S₆+O₄)₄·₁₄H₂O

Liszhenite is a very rare, secondary zinc and iron sulfate, forming aggregates of microscopic, tabular, yellow crystals.

## Characteristics Liszhenite is a hydrated zinc and iron sulfate, occurring as very fine, microscopic aggregates. It forms clusters composed of extremely small, tabular crystals, which rarely exceed 0.2 mm. Due to their size, individual crystals are usually observable only under a microscope. This mineral is brittle and has a characteristic, pale yellow color. ## Physical Properties Liszhenite crystals exhibit a vitreous luster. The Mohs hardness is low, at 2.5, which means it is a very soft mineral. Its density, calculated based on the chemical formula and unit cell parameters, is 2.45 g/cm³. ## Colors and Varieties This mineral occurs in a uniform, pale yellow color. No color varieties or commercial names are known. ## History and Name Liszhenite was discovered in the oxidation zone of the Xitieshan lead-zinc deposit in Qinghai Province, China. It was approved as a new mineral by the International Mineralogical Association (IMA) in 1989. Its name honors Li Shizhen (1518–1593), a prominent Chinese pharmacologist and mineralogist from the Ming Dynasty, author of the monumental work "Ben cao gang mu" ("Compendium of Materia Medica"), in which he described over 100 minerals and their medical applications.

Properties

Mohs hardness: 2.5
Luster: Vitreous
Streak: Light yellow
Density: 2.45
Cleavage: Perfect on {0001}
Fracture: Micaceous
Transparency: Transparent
Crystal system: Trigonal

Diagnostic features

## Identification Liszhenite is identified by its pale yellow color, occurrence as microscopic, tabular crystals, and characteristic geological environment – oxidation zones of sulfide deposits. A key feature is its water solubility. However, definitive identification requires advanced analytical methods such as X-ray diffraction (XRD) and chemical analysis (EDS). ## Differentiation from Similar Minerals It can be confused with other secondary iron sulfates, such as copiapite, metavoltine, or jarosite, which also have yellow colors and occur in similar environments. Liszhenite differs from them in its chemical composition (presence of zinc as a main component), specific crystal morphology (thin tablets), and unique X-ray diffraction pattern. ## Crystal Forms Liszhenite crystals are very small, thin, and tabular, with a hexagonal outline. They occur as single, scattered flakes or form rosette-like and spherulitic aggregates.

Geological environment

## Genesis Liszhenite is a secondary mineral, forming in oxidation zones (so-called iron caps) of sulfide deposits rich in zinc and iron. It forms in desert and arid conditions as a result of the weathering of primary minerals such as sphalerite and pyrite. It is a product of post-magmatic processes, forming at low temperatures. ## Mineral Associations This mineral co-occurs with other secondary sulfates, such as copiapite, metavoltine, voltaite, rhomboclase, as well as native sulfur, gypsum, and halite. ## Localities The only confirmed and described occurrence of liszhenite in the world is its type locality – the Xitieshan lead-zinc deposit, located on the northern edge of the Qaidam Basin in Qinghai Province, China.

Rarity

Extremely rare

For collectors

## Quality Criteria As a microscopic mineral, liszhenite is primarily valued for the abundance and quality of its crystals on the rock matrix. The most desirable specimens are those with well-formed, abundant crystal aggregates that form aesthetically pleasing clusters visible under magnification. A contrasting rock matrix also enhances the visual appeal of the specimen. Due to its rarity, every confirmed specimen has significant scientific and collector value. ## Popular Localities The only source of liszhenite specimens is the Xitieshan mine in China. Material from this locality is extremely difficult to acquire and very rarely appears on the collector's market.

Care and storage

## Cleaning Due to its extreme brittleness, softness, and water solubility, liszhenite should not be cleaned mechanically or with water. Any contact with water or cleaning solutions can damage or completely dissolve it. Specimens should be protected from dust. ## What to Avoid Contact with water, water vapor, and all chemicals must be strictly avoided. The mineral is sensitive to changes in humidity and temperature. It should not be heated or exposed to direct sunlight. It is very soft and brittle, so any touching or vibrations should be avoided. ## Storage Liszhenite specimens must be stored in dry conditions, preferably in tightly sealed containers (so-called "perky boxes") away from sources of moisture. The use of a desiccant (e.g., silica gel) inside the display container is recommended. Store at a stable temperature, away from light.

Sources

IMA Mineral List (CNMNC)