Konzettite

Chemical formula: CaMn₄+Te₆+O₆

Konzettite is an extremely rare calcium and manganese tellurate, forming microscopic, dark red crystals with a regular structure.

## Characteristics Konzettite is a mineral from the tellurate group, distinguished by its unique chemical composition including calcium, tetravalent manganese, and tellurium. It occurs as very small, isometric (cubic or octahedral) crystals, whose size does not exceed 50 micrometers (0.05 mm). It typically forms inclusions within other minerals. Its crystals have an intense, dark red color and a strong, almost metallic luster. ## Physical properties Due to the microscopic size of the crystals, most of konzettite's physical properties have not been precisely measured. Hardness is estimated at approximately 5 on the Mohs scale. Density, calculated based on chemical composition and crystal structure, is 5.11 g/cm³. The mineral is characterized by a strong, adamantine to submetallic luster. ## Colors and varieties This mineral occurs in a uniform, dark red color. No color or commercial varieties are known. ## History and name Konzettite was discovered in the Moctezuma mine in Mexico and officially recognized as a new mineral by the International Mineralogical Association (IMA) in 2023 (IMA2023-085). The name honors Jürgen Konzett, an Austrian experimental petrologist from the University of Innsbruck, for his contributions to the study of minerals and rocks under high pressure and temperature conditions. ## Applications Konzettite has no industrial applications. Its significance is purely scientific and collectible, as an extremely rare and newly discovered mineral species.

Properties

Mohs hardness: ~5
Luster: Adamantine to submetallic
Streak: Red
Density: 5.11
Cleavage: None
Fracture: Conchoidal
Transparency: Transparent to translucent
Crystal system: Cubic

Diagnostic features

## Identification Identification of konzettite is impossible without advanced analytical equipment. It requires microscopic magnification to observe the crystal form. Definitive identification is based on chemical analysis (EDS) to confirm the presence of Ca, Mn, and Te, and on X-ray diffraction to determine the crystal structure. ## Distinguishing from similar minerals Under the microscope, it may resemble other rare, red tellurates from the Moctezuma locality, such as kuranakhite or dugganite. Visual differentiation is unfeasible – chemical composition analysis is key. Konzettite is distinguished by the presence of calcium and manganese as primary cations. ## Crystal forms It forms very small, well-formed, isometric crystals, mainly in the shape of cubes and octahedra, with sizes not exceeding 50 µm.

Geological environment

## Genesis Konzettite forms in the oxidation zones of hydrothermal tellurium-rich deposits. Its formation is associated with volcanic activity. In its type locality (Moctezuma), it occurs in vugs and cavities within highly altered (friable) volcanic rocks (rhyolites). ## Mineral associations This mineral co-occurs with a number of other, often rare, tellurates and tellurites. It is most commonly associated with: emmonsite, schmitterite, eztlite, maysite, quetzalcoatlite, dugganite, cerussite, quartz, and barite. ## Localities The only confirmed occurrence of konzettite in the world is its type locality: Bambolla Mine (Moctezuma Mine), Moctezuma municipality, Sonora state, Mexico.

Rarity

Extremely rare

For collectors

## Quality criteria The quality of a konzettite specimen primarily depends on the abundance and visibility of microcrystals on the rock matrix. The most valued samples are those where the crystals, despite their microscopic size, are numerous, well-formed, and contrast with the surrounding minerals. Due to its extreme rarity, every analytically confirmed specimen has high scientific and collectible value. ## Popular localities The only source of specimens is the Moctezuma mine in Mexico, globally renowned for its unique and rare tellurium minerals.

Care and storage

## Cleaning Specimens containing konzettite, due to the microscopic size of the crystals and their embedding in the matrix, generally do not require and should not be mechanically cleaned. If necessary, compressed air (from a safe distance) can be used to remove dust. ## What to avoid Avoid contact with any chemicals, especially acids. Do not subject the specimen to ultrasound or sudden temperature changes. Due to its rarity, it should be handled with the utmost care. ## Storage It is recommended to store specimens in stable conditions, in a closed "micromount" box, to protect them from dust, mechanical damage, and moisture. Exposure to strong light is not advisable, although there is no data on its effect on the mineral.

Sources

IMA Mineral List (CNMNC)