Yangite

Chemical formula: Pb<sup>2+</sup>Mn<sup>2+</sup>Si<sub>3</sub>O<sub>8</sub>·H<sub>2</sub>O

Yangite is a hydrated lead and manganese silicate, forming unique, pink, tubular crystals.

## Characteristics Yangite is a very rare mineral from the silicate group, chemically classified as a hydrated lead and manganese silicate. Its most characteristic feature is the formation of hollow, tubular crystals, which grow up to about 1 mm in length and 0.1 mm in diameter. These crystals often form radial or tangled aggregates, resembling mineral wool in appearance. Due to their structure and small size, individual crystals are extremely delicate and brittle. ## Physical Properties Yangite crystals exhibit a luster described as silky or dull, depending on the aggregate form. They are elastic, which is an unusual characteristic for minerals. Hardness and density have not been precisely measured due to the small size and brittleness of the crystals. The mineral is translucent. ## Colors and Varieties Yangite occurs in a characteristic, pale pink hue. No color or commercial varieties are known. ## History and Name The mineral was approved by the International Mineralogical Association (IMA) in 2012 under number 2012-052. Its name honors Zhuming Yang (born 1963), a professor at the Institute of Geochemistry in Guangzhou (Chinese Academy of Sciences), in recognition of his contributions to mineralogy and crystallography. ## Applications Yangite has no industrial applications. It is solely an object of interest for collectors specializing in rare minerals and a subject of scientific research.

Properties

Mohs hardness
2
Luster
Silky
Streak
White
Density
4.29
Cleavage
Perfect on {100} and {010}
Fracture
Uneven
Transparency
Translucent
Crystal system
Tetragonal

Diagnostic features

## Identification Yangite is relatively easy to identify visually for an experienced eye due to its unique morphology. Characteristic, hollow, tubular crystals of a pale pink color, forming tangled or radial aggregates, are its main diagnostic feature. Its occurrence in paragenesis with other lead and manganese minerals in the Kombat mine is an additional clue. ## Distinguishing from Similar Minerals Due to its unique habit, yangite is difficult to confuse with other minerals. Some zeolites or other silicates may form acicular aggregates, but they rarely have a tubular structure and pink color in combination with the genesis typical of yangite. ## Crystal Forms The mineral forms elongated, tubular (hollow) crystals with a cross-section close to square. These crystals combine into radial, tangled, or chaotic aggregates.

Geological environment

## Genesis Yangite is a mineral of hydrothermal origin. It formed as a result of contact metamorphism of manganese ore deposits. It occurs in vugs and small rock fissures. ## Mineral Associations This mineral co-occurs with minerals such as baryte, hausmannite, manganite, as well as other rare lead and manganese silicates, e.g., kombatite and jerrygibbsite. ## Localities The only confirmed occurrence (type locality) of yangite in the world is the Kombat mine, located in the Grootfontein district of the Otjozondjupa region in Namibia.

Rarity

Very rare

For collectors

## Quality Criteria The most valuable yangite specimens are those that possess rich, dense clusters of well-formed, tubular crystals with intense, pink coloration. The aesthetic composition on the rock matrix and the absence of damage to the delicate needles are also important. Contrast with associated minerals, such as white baryte, can enhance the specimen's attractiveness. ## Popular Localities All known and valued yangite specimens come from a single location in the world - the Kombat mine in Namibia. This is the only source of this mineral.

Care and storage

## Cleaning Yangite specimens are extremely delicate. They should not be cleaned mechanically or chemically. The safest method for removing dust is to use a photographer's air blower or compressed air from a very long distance and at minimal pressure. ## What to Avoid Avoid any contact with water, chemical agents, and ultrasound. The crystals are very brittle and sensitive to vibrations and temperature changes. Do not expose specimens to direct sunlight. ## Storage It is recommended to store specimens exclusively in sealed, padded "micromount" boxes to protect them from mechanical damage, dust, and moisture. Minimize touching and moving the specimen.

External references

Sources

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