Whiteite-(CaMnFe)
Chemical formula: CaMn²⁺Fe²⁺₂Al₂(PO₄)₄(OH)₂·8H₂O
A rare phosphate mineral, forming small, transparent crystals with a vitreous luster, prized by specialized collectors.
Properties
- Mohs hardness
- 4
- Luster
- Vitreous
- Streak
- White
- Density
- 2.80
- Cleavage
- Good on {010}
- Fracture
- Uneven
- Transparency
- Transparent
- Crystal system
- Monoclinic
Diagnostic features
## Identification Whiteite-(CaMnFe) is identified by its small, tabular crystals with a vitreous luster, often colorless or pale yellow, occurring in paragenesis with other phosphates in granitic pegmatites. Due to the small size of the crystals, definitive identification requires advanced analytical methods such as X-ray spectroscopy (XRD) or chemical analysis (EDS). ## Distinguishing from Similar Minerals It can be confused with other microcrystalline phosphates, such as apatite, wardite, or other minerals from the whiteite group. Differentiation with the naked eye is practically impossible and requires laboratory analysis to confirm the chemical composition, especially the presence of calcium, manganese, and iron in specific proportions. ## Crystal Forms It crystallizes in the form of small, tabular crystals with a hexagonal or octagonal outline, as well as short prisms. Crystals often form small, rosette-like aggregates or grow on other minerals.
Geological environment
## Genesis It is a secondary phosphate mineral, formed by hydrothermal processes in alteration zones of granitic pegmatites, rich in phosphorus. It forms in rock cavities and fissures, crystallizing from post-magmatic solutions during the late stages of their cooling. ## Mineral Associations It co-occurs with other phosphate minerals typical of pegmatites, such as zwieselite, triplite, rockbridgeite, strengite, hureaulite, and phosphosiderite. ## Localities The most important and type locality is the Hagendorf Süd pegmatite in Bavaria (Germany). It is also known from several other localities worldwide, including the Custer Mountain mine in South Dakota (USA) and pegmatites in Brazil.
Rarity
Very rare
For collectors
## Quality Criteria The most prized specimens are those with well-formed, sharp, and transparent crystals, clearly contrasting with the matrix. Aesthetic composition with other, color-contrasting associated minerals is also important. Due to the small size of the crystals, specimens with aggregates larger than a few millimeters are considered exceptional. ## Popular Localities Classic and most sought-after specimens by collectors come from the type locality - Hagendorf Süd in Germany. Material from this mine serves as the standard for the species.
Care and storage
## Cleaning Crystals can be dry-cleaned with a soft brush. For heavier soiling, distilled water may be used. Avoid washing under running water due to the risk of damaging delicate crystals. ## What to Avoid Avoid contact with acids and strong detergents, which can damage the mineral's surface. It is sensitive to high temperatures and sudden changes in temperature. Prolonged exposure to direct sunlight can lead to fading. ## Storage It is recommended to store specimens in separate, padded boxes or display cases to prevent scratches and chipping. Due to its brittleness, it should be protected from vibrations and impacts.