Manganflurlite
Chemical formula: Zn<sup>2+</sup>Mn<sup>2+</sup><sub>3</sub>Fe<sup>3+</sup>(PO<sub>4</sub>)<sub>3</sub>(OH)<sub>2</sub>(H<sub>2</sub>O)<sub>7</sub>·2H<sub>2</sub>O
Manganflurlite is a rare hydrated zinc, manganese, and iron phosphate, forming aggregates of small, tabular, brownish-red crystals.
Properties
- Mohs hardness
- 3
- Luster
- Vitreous
- Streak
- Light brown
- Density
- 2.63
- Cleavage
- Good on {010}
- Fracture
- Uneven
- Transparency
- Transparent to translucent
- Crystal system
- Monoclinic
Diagnostic features
## Identification Field identification of manganflurlite is practically impossible. Identification requires specialized analytical methods, such as Raman spectroscopy or X-ray diffraction (XRD) combined with chemical analysis (EDS). In a collection, it can be preliminarily recognized by its characteristic brownish-red color, the form of small, tabular crystals forming rosette-like aggregates, and its association with other rare phosphates from Hagendorf. ## Differentiation from Similar Minerals It can be confused with other fine-grained, secondary phosphates of similar color, such as cacoxenite or some minerals from the mitridatite group. Definitive differentiation is possible only with advanced analytical techniques that allow for the determination of the exact chemical composition and crystal structure. ## Crystal Forms It forms very small, thin, bladed or tabular crystals, elongated along the [001] axis. These crystals almost always occur as radial or rosette-like aggregates and clusters.
Geological environment
## Genesis Manganflurlite is a secondary phosphate mineral. It forms in the oxidation zones of complex granitic pegmatites rich in phosphates. It develops as a result of the alteration and weathering of primary phosphate minerals, such as zwieselite, in the presence of solutions rich in manganese, zinc, and iron. ## Mineral Associations At the type locality (Hagendorf-Süd), manganflurlite co-occurs with other rare, secondary phosphates, such as beraunite, strunzite, laueite, stewartite, jahnsite-(CaMnMn), and quartz. ## Localities The only confirmed and described occurrence of manganflurlite in the world is its type locality: the Hagendorf-Süd pegmatite in Waidhaus, Upper Palatinate, Bavaria (Germany).
Rarity
Very rare
For collectors
## Quality Criteria As a "micromount" type mineral, the quality of a specimen is primarily determined by the richness and development of the crystal aggregates. Specimens with clearly formed, undamaged rosettes or radial clusters of intense, brownish-red color are most highly valued. It is also important that the crystals are well-exposed on the rock matrix and contrast with it. The presence of rare associated minerals can further increase the value of the specimen. ## Popular Localities All known collector specimens come from a single location in the world – the Hagendorf-Süd mine in Bavaria, Germany. This is a classic locality for many rare phosphate minerals, and specimens from there are highly prized by specialists.
Care and storage
## Cleaning Due to the fragility and small size of the crystals, mechanical cleaning is highly risky. If absolutely necessary, compressed air can be used from a safe distance to remove dust. Avoid contact with water, which may affect the hydrated structure of the mineral. ## What to Avoid Absolutely avoid all chemicals, especially acids, which can destroy the mineral. It should be protected from high temperatures, which can lead to dehydration and structural changes. Specimens should be protected from shocks and impacts. ## Storage Manganflurlite specimens are best stored in closed, padded "micromount" boxes to protect them from mechanical damage and dust. Display should be in stable conditions, away from direct sunlight and heat sources.