Lisanite
Chemical formula: CaNi²⁺P₂O₇
Lisanite is a very rare calcium nickel pyrophosphate, forming microscopic, platy, green crystals.
Properties
- Luster
- Vitreous
- Streak
- Light green
- Cleavage
- Perfect on {0001}
- Transparency
- Transparent
- Crystal system
- Triclinic
Diagnostic features
## Identification Identification of lisanite is only possible using advanced analytical methods, such as Raman spectroscopy and X-ray diffraction (XRD), due to its microscopic size. Visual identification in the field or in a collection is practically impossible. Its characteristic light green color and co-occurrence with other rare minerals in a specific geological environment are key indicators for specialists. ## Crystal Forms Lisanite forms very small, thin, platy crystals with a hexagonal outline, whose size does not exceed 20 micrometers. These crystals often combine into rosette-like aggregates.
Geological environment
## Genesis Lisanite forms as a result of pyrometamorphic processes occurring in the sediments of the Hatrurim Formation, also known as the "Mottled Zone". These processes involve the spontaneous combustion of bituminous substances contained in sedimentary rocks (marls, limestones), leading to the formation of high-temperature, low-pressure mineral parageneses under oxidizing conditions. This process is analogous to natural cement burning. ## Mineral Associations This mineral co-occurs with other products of pyrometamorphism, such as calcite, aragonite, fluorite, as well as rarer minerals, e.g., gurimite, within calcareous-silicate rocks. ## Localities The only confirmed locality of lisanite in the world is its type locality in the Hatrurim Formation, in the Dead Sea basin, in Israel.
Rarity
Extremely rare
For collectors
## Quality Criteria Due to the microscopic nature of lisanite, it is not an item traded in the collector's market in the traditional sense. Its value is purely scientific. Any potential specimens would be in the form of a fragment of the host rock (matrix) with microscopic crystals, whose presence would have to be analytically confirmed. In such a case, the value would be determined by the abundance of crystals and the presence of associated minerals.
Care and storage
## Characteristics Lisanite is a newly discovered, very rare mineral from the pyrophosphate group. It was approved by the International Mineralogical Association (IMA) in 2023 under number 2023-085. Its name comes from the Lisan Peninsula on the Dead Sea, where its type locality is situated. This mineral occurs as extremely small, platy crystals, reaching sizes up to 20 micrometers. These crystals form aggregates and rosettes. Due to their microscopic size, its visual features are difficult to observe without specialized equipment. ## Physical Properties Lisanite has a light green color and a vitreous luster. Its hardness and density have not yet been precisely measured due to the small size of the samples. It is a transparent mineral with a light green streak. ## History and Name The name "lisanite" refers to the Lisan geological formation, where the mineral was discovered. This formation is located in the area of Israel and Jordan. The mineral was described by a team of scientists, including Evgeny V. Galuskin, Irina O. Galuskina, and Yevgeny Vapnik, and its discovery is the result of research into the unique geology of the Dead Sea region.