Stones of the like kind were sought for; and among these fluor-spar, which is not scarce in Germany.
There are also spar works where the fluor-spar, or Blue John, is wrought into a variety of useful and ornamental articles.
The most beautiful are those made of fluor-spar, the celebrated Blue John Mine providing the most beautiful specimens.
Fluor: fluor-spar as free as possible from other minerals, powdered.
fluor-spar, a mineral of beautiful colors, composed by fluorine and calcium.
From fluor-spar (free from silica and metallic sulphides) and oil of vitriol.
Place the glass in a shallow bath, and cover it evenly with fluor-spar to the depth of an eight of an inch.
Fluorine is frequently met with as calcium fluoride or fluor-spar (CaF2).
The photo-electric excitability of fluor-spar crystals is increased by a moderate heat (80° to 100° C.).
Limestone, fluor-spar, borax, and several earthy or metallic oxides are employed as fluxes in metallurgy.
A transparent to translucent mineral occurring in many colors, especially yellow and purple, and usually in cube-shaped crystals with octahedral cleavage. It is found in sedimentary rocks and in ore deposits within igneous rocks. It is often fluorescent in ultraviolet light. Chemical formula: CaF2.