Yaroslavite
Yaroslavite is an IMA-recognized mineral species in the halide class, with the chemical formula Ca₃Al₂F₁₀(OH)₂·H₂O.
It crystallizes in the orthorhombic crystal system.
Key properties: specific gravity 3.09; Vitreous luster; optically biaxial.
IMA symbol Ysl, IMA status: approved, named in 1966.
From the oxidized zone of a banded sellaite-tourmaline-fluorite deposit.
It is found associated with Sellaite, gearksutite, chukhrovite-(Ce).
The name refers to its occurrence in the Yaroslavsk deposit, Russia.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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