Jagowerite
Chemical formula: BaAl₂(PO₄)₂(OH)₂
Jagowerite is a very rare barium aluminum phosphate, forming colorless to pale blue, tabular crystals with a pearly luster.
Properties
- Mohs hardness
- 4.5
- Color
- Light green
- Luster
- Pearly
- Streak
- White
- Density
- 4.01
- Cleavage
- {100} good, {011} good, <mi>{0_11}</mi> fair
- Fracture
- Uneven
- Transparency
- Translucent
- Crystal system
- Triclinic
Diagnostic features
## Identification Jagowerite can be recognized by its characteristic appearance: small, thin, tabular crystals, often in rosette-like aggregates, with a strong pearly luster on flat surfaces. Its light blue color, when present, is also a helpful feature. Due to its size, identification usually requires magnification. ## Distinguishing from Similar Minerals It can be confused with other rare phosphates of similar habit, such as wardite or lazulite; however, jagowerite is distinguished by its very strong pearly luster and specific occurrence environment. Final confirmation requires advanced analytical methods (XRD, EDS). ## Crystal Forms Crystals are thin, tabular, with a hexagonal or rhombic outline. They typically form radial or rosette-like aggregates, as well as fan-shaped clusters on the surface of the host rock.
Geological environment
## Genesis Jagowerite is a secondary mineral, formed in low-temperature hydrothermal zones. In its type locality (Yukon, Canada), it occurs in veins cutting black shales. It likely formed as a result of the alteration of minerals containing barium, aluminum, and phosphorus. ## Mineral Associations This mineral co-occurs with minerals such as quartz, lazulite, wardite, augelite, goyazite, apatite, and iron sulfides (pyrite, marcasite). ## Localities The only confirmed and well-documented occurrence of jagowerite in the world is its type locality: the area along the Hess River, in the Mayo region, Yukon Territory, Canada.
Rarity
Extremely rare
For collectors
## Quality Criteria The most prized jagowerite specimens are those with well-formed, sharply terminated crystals forming aesthetic, rosette-like aggregates. The intensity of the blue color, though usually pale, also increases the specimen's value. Contrast with the rock matrix and the absence of damage to the delicate crystals are important. Due to the microscopic nature of the mineral, specimens are evaluated under magnification. ## Popular Localities The only source of collector specimens is the type locality in the Yukon Territory, Canada. Material from this location is extremely rare and highly sought after by collectors specializing in rare mineral species.
Care and storage
## Cleaning Jagowerite specimens are extremely delicate and small. Mechanical cleaning should be avoided. If absolutely necessary, compressed air (from a safe distance) can be used to remove loose dust. The use of water or any liquids is not recommended. ## What to Avoid Contact with chemicals, especially acids, which can damage it, must be strictly avoided. The mineral is soft and brittle, susceptible to scratches and mechanical damage. It should be protected from ultrasound, vibrations, and sudden temperature changes. ## Storage Jagowerite specimens should be stored in stable conditions, preferably in sealed "micromount" boxes, which protect them from dust, moisture, and physical damage. Avoid exposure to direct sunlight.