Manganoschafarzikite
Chemical formula: Mn<sup>2+</sup>Sb<sup>3+</sup><sub>2</sub>O<sub>4</sub>
A rare manganese and antimony oxide, forming small, tabular or prismatic crystals of reddish-brown to black color.
Description
## Characteristics Manganoschafarzikit is a manganese and antimony oxide (Mn²⁺Sb³⁺₂O₄), being the manganese analogue of schafarzikit. It forms small, usually microscopic crystals with a short-prismatic or tabular habit. It typically occurs in radial or tangled aggregates. It is an opaque mineral with a reddish-brown, brownish-black, or black color. ## Physical Properties Its Mohs hardness is 4.5, and its density is approximately 5.29 g/cm³. It exhibits a submetallic luster. It has good cleavage in one direction, and its fracture is uneven. The streak is reddish-brown. ## Colors and Varieties This mineral occurs in shades from reddish-brown to black. No color or commercial varieties are distinguished. ## History and Name It was first described in 1981. Its name refers to its chemical composition – the presence of manganese (mangano-) – and its relationship to schafarzikit (FeSb₂O₄), of which it is the manganese analogue. The name of the parent mineral honors the Hungarian geologist Franz Schafarzik (1854-1927). ## Applications Due to its rarity, manganoschafarzikit has no industrial applications. It is of scientific and collector's interest only.
Diagnostic features
## Identification Identification of manganoschafarzikit is based on its characteristic reddish-brown to black color, submetallic luster, and relatively high density. It occurs in a specific geological environment, in association with other antimony minerals. Due to the small size of the crystals and similarity to other minerals, definitive identification usually requires advanced studies, such as X-ray microanalysis (EDS). ## Distinguishing from Similar Minerals It is visually indistinguishable from schafarzikit (FeSb₂O₄) – this requires chemical analysis to determine the dominance of manganese over iron. From other dark oxide minerals, such as hematite or goethite, it is distinguished by its crystal habit (tetragonal), higher density, and co-occurrence with antimony minerals. ## Crystal Forms It crystallizes in the tetragonal system. It forms short, prismatic or thick, tabular crystals. It is often found in radial or disordered aggregates and clusters, growing on other minerals.
Geological environment
## Genesis Manganoschafarzikit is a secondary mineral, forming in the oxidation zones of hydrothermal ore deposits rich in antimony and manganese. ## Mineral Associations It most commonly co-occurs with minerals such as schafarzikit, brandholzite, valentinite, senarmontite, native antimony, stibnite, and various manganese oxides. ## Localities As a very rare mineral, it is known from only a few localities worldwide. The type locality is the Fichtenhübel mine in Hunsrück (Rhineland-Palatinate, Germany). Other confirmed localities include the Pereta mine in Tuscany (Italy) and some deposits in the Harz Mountains in Germany.
Rarity
Very rare
Collector aspects
## Quality Criteria The most highly valued specimens are those with well-formed, sharp crystals, even if they are microscopic in size. The abundance of clusters on the rock matrix and association with other rare minerals are of great importance. Specimens from the type locality (Fichtenhübel) are particularly sought after by collectors specializing in rare minerals and systematics. ## Popular Localities The most well-known collector's specimens come from the Fichtenhübel mine in Germany and the Pereta mine in Italy. These are the main sources of material available on the collector's market.
Care and storage
## Cleaning Specimens should only be cleaned mechanically, using a soft brush or paintbrush. Distilled water can be used to remove loose debris. Ultrasonic cleaners are not recommended, as they can damage delicate aggregates. ## What to Avoid The mineral is sensitive to strong acids. Avoid sudden temperature changes and prolonged exposure to direct sunlight, although its color is considered stable. ## Storage It is recommended to store specimens in a dry, stable environment, in sealed boxes or display cases, to protect them from dust and mechanical damage. Avoid contact with harder minerals that could scratch its surface.