Shasuite
Chemical formula: CaNi²⁺₃(P₂O₇)₂
Shasuit is an extremely rare calcium nickel pyrophosphate, forming microscopic, green crystals, discovered in Israel.
Properties
- Luster
- Vitreous
- Density
- 4.09
- Transparency
- Translucent
- Crystal system
- Monoclinic
Diagnostic features
## Identification Identification of shasuit is possible only through advanced analytical methods, such as Raman spectroscopy, X-ray diffraction (XRD), and chemical analysis using an electron microprobe (EDS/WDS). Visual identification in the field or even under a microscope is practically impossible without laboratory confirmation. ## Distinguishing from Similar Minerals Shasuit can be confused with other secondary, green nickel minerals, such as nickeline or other phosphates and arsenates. Definitive differentiation requires specialized analysis of chemical composition and crystal structure. ## Crystal Forms It forms microscopic, tabular or lamellar crystals, usually grouped into rosette-like or radial aggregates and thin coatings on the surface of the host rock.
Geological environment
## Genesis Shasuit forms under the unique geological conditions of the Hatrurim Formation, known for pyrometamorphism – the natural burning of sedimentary rocks (marls) at high temperatures, caused by the combustion of underground bitumen deposits. The mineral crystallizes in the late stage of this process, in fissures and voids of the burned rocks, as a result of low-temperature hydrothermal reactions. ## Mineral Associations This mineral co-occurs with other rare minerals characteristic of the Hatrurim Formation, such as nickeline, barite, calcite, aragonite, and minerals from the apatite group. ## Localities The only confirmed occurrence of shasuit in the world is its type locality: Wadi Halamish in the Hatrurim Basin, near the Dead Sea in Israel.
Rarity
Extremely rare
For collectors
## Quality Criteria As a mineral of primarily scientific and systematic importance, the collector's value of shasuit is mainly associated with its extreme rarity and origin from the type locality. Specimens with the largest and richest crystal aggregates, and whose green color is clearly visible against the host rock, are most highly valued. Confirmation of the specimen's authenticity through analysis is also crucial.
Care and storage
## Cleaning Due to the extremely small size of the crystals and their occurrence as coatings on the host rock, mechanical cleaning is neither recommended nor possible without the risk of damaging the specimen. Any contaminants should be left undisturbed. ## What to Avoid Avoid contact with any chemicals, especially acids, which can destroy the mineral. Specimens should be protected from vibrations, shocks, and attempts to scratch them. They should not be heated or exposed to ultrasound. ## Storage Shasuit specimens, as microminerals, should be stored in specialized, sealed "micromount" boxes that protect them from dust, moisture, and mechanical damage. Store under stable temperature conditions, away from direct sunlight.