It is obtained from decomposition of fluorspar by strong sulphuric acid.
"American Handbook of the Daguerrotype" by Samuel D. Humphrey
When the experiment is performed in the fluorspar tube, the gaseous fluoride may be collected over mercury.
"Scientific American Supplement, No. 832, December 12, 1891" by Various
Fluorspar is often mixed with boracic acid, which renders it unfit for analytical purposes.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
The deoxidizing slag is now formed by additions of lime, coke and fluorspar (and for some analyses ferrosilicon).
"The Working of Steel" by Fred H. Colvin
Hydrofluoric acid is readily obtained from fluorspar by the action of concentrated sulphuric acid.
"An Elementary Study of Chemistry" by William McPherson
Those stones which show electricity on the application of pressure are such as the fluorspar, calcite, and topaz.
"The Chemistry, Properties and Tests of Precious Stones" by John Mastin
The chief use of fluorspar is as a flux in the manufacture of open-hearth steel.
"The Economic Aspect of Geology" by C. K. Leith
The oxyfluoride, CrO2F2, is obtained in a similar manner to the oxychloride by using fluorspar in place of common salt.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3" by Various
These were probably quartz in this instance, although fluorspar is also included in this same genus.
"De Re Metallica" by Georgius Agricola
The centre of the fluorspar district was Rosiclare in Hardin county.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various
Berkh Uul JSC (MSE: BEU) is pleased to announce the receipt of a NI 43-101 compliant Resource Report from Micromine, the international geological consulting firm, for the Delgerkhan Fluorspar Project.
Silica exposure during fluorspar mining and processing is a likely cause.
Berkh Uul JSC (MSE: BEU) is pleased to announce the receipt of a NI 43-101 compliant Resource Report from Micromine, the international geological consulting firm, for the Delgerkhan Fluorspar Project HIGHLIGHTS.