Zadovite
Chemical formula: BaCa<sub>6</sub>[(SiO<sub>4</sub>)(PO<sub>4</sub>)](PO<sub>4</sub>)<sub>2</sub>F
Zadovite is a rare barium calcium fluorophosphatesilicate, forming colorless, hexagonal crystals, discovered in Jordan.
Properties
- Mohs hardness
- 5
- Luster
- Vitreous
- Streak
- White
- Density
- 3.83
- Cleavage
- Imperfect on {0001}
- Fracture
- Uneven
- Transparency
- Transparent
- Crystal system
- Hexagonal
Diagnostic features
## Identification Zadovite is identified based on its unique chemical composition (presence of barium, calcium, phosphorus, and silicon), hexagonal crystal form, and occurrence in the specific environment of pyrometamorphic rocks of the Hatrurim Formation. Identification requires advanced analytical techniques such as Raman spectroscopy or X-ray microanalysis (EDS). ## Distinguishing from similar minerals It can be confused with other minerals from the apatite group or other colorless minerals found in the Hatrurim Formation. Distinguishing it from fluorapatite, fluorcaphite, or nabimusaite requires specialized laboratory tests due to visual and physical similarities. ## Crystal forms It forms hexagonal, prismatic or tabular crystals, often terminated by pyramids.
Geological environment
## Genesis Zadovite forms under pyrometamorphic conditions, as a result of natural combustion and melting of sedimentary rocks (marls). This process occurs at high temperatures and low pressure. The mineral crystallizes in voids and fractures of altered rocks. ## Mineral associations This mineral co-occurs with other rare minerals of the Hatrurim Formation, such as jurbarkasite, nabimusaite, aradite, larnite, brownmillerite, mayenite, as well as fluorapatite and fluorellestadite. ## Localities The only confirmed locality of zadovite in the world is its type locality – Nabi Musa hill, part of the Hatrurim Formation, Judean Desert, Jordan.
Rarity
Very rare
For collectors
## Quality criteria As a microscopic mineral, zadovite is primarily valued by collectors specializing in "micromounts" and rare and systematic minerals. Specimens with well-formed, sharp, transparent crystals, clearly embedded in the rock matrix and contrasting with it, are most highly rated. The presence of rare associated minerals is also important.
Care and storage
## Cleaning Due to their small size and rarity, specimens with zadovite usually do not require cleaning. If necessary, only compressed air should be used to remove dust. ## What to avoid Avoid contact with chemicals, acids, and ultrasonic cleaners. The mineral is brittle, so it should be protected from impacts and scratches. ## Storage Specimens with zadovite, due to the microscopic size of the crystals, are best stored in specialized "micromount" boxes, protecting them from dust and mechanical damage.