Rewitzerite

Chemical formula: K(H₂O)Mn²⁺₂(Al₂Ti⁴⁺)(PO₄)₄[O(OH)](H₂O)₁₀·4H₂O

Rewitzerite is an extremely rare phosphate mineral, forming microscopic, yellow crystals, discovered in a quarry in Bavaria.

## Characteristics Rewitzerite is a hydrated phosphate of potassium, manganese, aluminum, and titanium. It occurs as extremely small, bladed or tabular crystals, reaching sizes up to 0.2 mm. These crystals are typically transparent, yellow in color, and have a vitreous luster. Due to its extreme rarity and microscopic size, it is a mineral known primarily in scientific and specialized circles. ## Physical Properties Rewitzerite crystals exhibit a vitreous luster. They are too small and rare for their hardness, density, or other physical properties to be determined macroscopically by standard methods. This data comes from crystallographic studies. ## Colors and Varieties This mineral has only been observed in yellow. No varieties are distinguished. ## History and Name Rewitzerite was approved as a new mineral species by the International Mineralogical Association (IMA) in 2022 (IMA2022-038). Its name honors Christian Rewitzer, a German mineral collector who found the type material. The mineral was described by a research team led by Ian E. Grey based on specimens from the type locality. ## Uses Rewitzerite has no commercial or industrial applications. Its significance is purely scientific and as a collector's item, as a unique mineralogical species.

Properties

Mohs hardness
2
Color
colorless
Luster
Vitreous
Streak
Light yellow
Density
2.33
Cleavage
Perfect on {100}
Fracture
Uneven
Transparency
Transparent
Crystal system
Monoclinic

Diagnostic features

## Identification Identification of Rewitzerite is impossible without advanced laboratory equipment. It requires chemical analysis (EDS) and structural analysis (XRD) to confirm its composition and crystal structure. Visually, under high magnification, characteristic, tiny, yellow crystals with a bladed habit can be observed. ## Distinguishing from Similar Minerals At the type locality, Rewitzerite may be confused with other yellow secondary phosphates. Distinguishing it from minerals such as Cacoxenite or Leucophosphite requires specialized analytical studies. ## Crystal Forms Rewitzerite forms very small, elongated, bladed crystals, often gathered in small, radial or chaotic aggregates on the surface of the host rock.

Geological environment

## Genesis Rewitzerite is a secondary mineral that crystallizes in the late stage of hydrothermal processes in phosphate-rich granitic pegmatites. It forms as a result of the alteration of pre-existing phosphate minerals in oxidation zones. ## Mineral Associations At the type locality, Rewitzerite is associated with quartz, Strengite, Leucophosphite, Rockbridgeite, Jahnsite-(CaMnMn), and other rare phosphates. ## Localities The only confirmed locality of Rewitzerite in the world is its type locality - the Hagendorf-Süd quarry in Waidhaus, Upper Palatinate, Bavaria (Germany).

Rarity

Extremely rare

For collectors

## Quality Criteria The quality of a Rewitzerite specimen is assessed based on the abundance and development of microscopic crystals on the rock matrix. The most desirable specimens are those with numerous, clearly visible under the microscope, sharply terminated crystals forming aesthetic clusters. Contrast with the host rock color also enhances visual value. ## Popular Localities The only source of specimens is the Hagendorf-Süd quarry in Germany. Material from this locality is extremely difficult to obtain and appears on the market very rarely, mainly circulating among specialized micromount collectors.

Care and storage

## Cleaning Specimens containing Rewitzerite, due to the microscopic size and delicacy of the crystals, should not be cleaned mechanically or chemically. Any attempts at cleaning risk irreversible damage to the mineral. They should be left undisturbed on the host rock. ## What to Avoid Avoid contact with any liquids, chemicals, as well as changes in temperature and humidity. The crystals are brittle and sensitive to shocks and touch. Do not expose the specimen to direct sunlight. ## Storage Specimens should be stored exclusively in specialized, sealed "micromount" boxes, protecting them from dust, moisture, and mechanical damage. It is best to store them under stable room conditions.

External references

Sources

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