Zincovelesite-6N6S

Chemical formula: Zn₂+₃(Fe₃+,Mn₃+,Al,Ti₄+)₈O₁₅(OH)

Zincohögbomite-6N6S is a very rare oxide from the högbomite group, named after its discovery locality in the Veles mine in North Macedonia.

## Characteristics Zincohögbomite-6N6S is an extremely rare mineral from the högbomite supergroup. It occurs as hexagonal, tabular crystals up to 0.2 mm in size, forming aggregates. The crystals are black and opaque, with a metallic luster. ## Physical Properties This mineral is characterized by a hardness of approximately 6 on the Mohs scale. Its density, calculated based on the formula and cell parameters, is 4.55 g/cm³. It has a black streak and a metallic luster. ## History and Name The name "zincohögbomite-6N6S" refers to its chemical composition (dominant zinc), its discovery locality (Veles mine in North Macedonia), and its structural affiliation to the 6N6S polysome within the högbomite supergroup. It was approved as a new mineral by the IMA in 2002 (IMA2002-040).

Properties

Mohs hardness: 6
Luster: Metallic
Streak: Black
Density: 4.55
Cleavage: None
Fracture: Uneven
Transparency: Opaque
Crystal system: Hexagonal

Diagnostic features

## Identification Identification of zincohögbomite-6N6S is only possible using advanced analytical methods, such as X-ray diffraction (XRD) and chemical analysis (EDS/WDS). Visually, it is indistinguishable from other black, metallic oxide minerals occurring in similar environments, such as magnetite, franklinite, or other minerals from the högbomite group. ## Distinguishing from Similar Minerals It can be confused with magnetite, franklinite, gahnite, or other minerals from the spinel and högbomite groups. Definitive differentiation requires specialized laboratory tests to determine its chemical composition and crystal structure. ## Crystal Forms It forms small, hexagonal, tabular crystals, usually grouped into small aggregates.

Geological environment

## Genesis Zincohögbomite-6N6S forms in metamorphic rocks, particularly in dolomitic marbles that have undergone contact metamorphism due to magmatic intrusions. It occurs in zinc- and iron-rich skarn zones. ## Mineral Associations It co-occurs with minerals such as franklinite, gahnospinel, dolomite, calcite, phlogopite, titanite, rutile, graphite, and other minerals from the högbomite group. ## Localities The only confirmed locality for this mineral in the world (type locality) is the Crn Vrv (Veles) mine, in the Municipality of Čaška, North Macedonia.

Rarity

Extremely rare

For collectors

## Quality Criteria As a "micromount" type mineral of scientific value, its primary quality criterion is the certainty of analytical identification. Specimens with well-formed, though microscopic, crystals, clearly embedded in the rock matrix and co-occurring with other rare minerals, are highly valued. Crystal size and the richness of aggregates increase the specimen's value.

Care and storage

## Cleaning Due to its extreme rarity and small crystal size, mechanical cleaning is not recommended. If absolutely necessary, compressed air can be used to remove dust. Contact with water and chemicals should be avoided. ## What to Avoid All chemicals, acids, and ultrasonic cleaning should be avoided. The mineral should be protected from abrasion and mechanical damage. ## Storage Specimens should be stored in stable conditions, in a specialized "micromount" box, protecting them from dust, moisture, and physical damage.

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