Yaroslavite
Yaroslavite is a rare mineral with the chemical formula calcium aluminum fluoride hydroxide hydrate, Ca3Al2F10(OH)2·H2O. It crystallizes in the orthorhombic system and is classified as a fluoride mineral. This mineral is typically colorless or white, with a vitreous luster. It has a relatively low hardness on the Mohs scale and a moderate density. As a member of the fluoride mineral class, yaroslavite is notable for its complex chemical composition and its association with specific geological environments. Its properties make it a subject of interest for mineralogical study.
Composition
- FFluorine45.6%
- CaCalcium28.9%
- AlAluminium13.0%
- OOxygen11.5%
- HHydrogen1.0%
Overview
Yaroslavite is a rare mineral with the chemical formula calcium aluminum fluoride hydroxide hydrate, Ca3Al2F10(OH)2·H2O. It crystallizes in the orthorhombic system and is classified as a fluoride mineral. This mineral is typically colorless or white, with a vitreous luster. It has a relatively low hardness on the Mohs scale and a moderate density. As a member of the fluoride mineral class, yaroslavite is notable for its complex chemical composition and its association with specific geological environments. Its properties make it a subject of interest for mineralogical study.
Etymology
Yaroslavite is named after the Yaroslavskoye tin deposit, the location of its discovery. The mineral was approved by the International Mineralogical Association (IMA) and retains its name in honor of this locality.
How to recognize it
Yaroslavite can be identified by its colorless or white color and vitreous luster. It has a relatively low hardness on the Mohs scale, making it easily scratched by harder minerals. Its specific gravity is moderate, and it does not leave a distinct streak. Due to its rarity and similarity to other fluoride minerals, it may be confused with related species without detailed chemical analysis.
Indicative prices
Yaroslavite is a rare mineral and is not commonly traded as a gemstone or in jewelry. As such, there are no established market prices for yaroslavite in commercial jewelry or gemstone markets. Specimens for collectors may vary by source and quality, but indicative price ranges are not widely documented. Value depends on origin, clarity, and rarity of the specimen.