Note 27 — MINERALS.
Reading edition
Fluoric Acid is a gas of very singular nature, which is held in combination with lime, in the Derbyshire or fluor spar (194); and may be separated from it by pouring sulphuric acid, or spirit of vitriol (24), upon powdered spar, in a leaden vessel called a retort, and applying to it a gentle heat. The salts formed by fluoric acid have the name of fluats.