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not real; fictitious; as, a fabulous description; a fabulous hero. The fabulous birth of Minerva. Chesterfield.

A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron.

A small lateral lode falling into the main lode or mineral vein. Ure.

A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The…

A mineral of a brownish black color, essentially a tantalo- niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson.

ubes of copper separated by an insulating material composed of paper saturated with black mineral wax.

-- called also feverwort amd horse gentian. -- Fever sore, a carious ulcer or necrosis. Miner.

A white crystallized mineral resin from the Fichtelgebirge, Bavaria.

llust. under Brain. -- Fissure vein (Mining), a crack in the earth's surface filled with mineral matter. Raymond.

A miner's two-pointed pick.

y) A mill in which flints are ground. (b) (Mining) An obsolete appliance for lighting the miner at his work, in which flints on a revolving wheel were made to produce a shower of sparks, which gave light, but did not inflame the fire damp. Knight. -- Flint stone, a hard, siliceous stone; a flint. -- Flint wall, a kin…

of cerium, occuring near Fahlun in Sweden. Tynosite, from Colorado, is probably the same mineral.

Calcium fluoride, a mineral of many different colors, white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor.…

Any substance or mixture used to promote the fusion of metals or minerals, as alkalies, borax, lime, fluorite.

Capable of being melted or fused, as a mineral. Holland. -- Flux"i*ble*ness, n.

imes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the bedding, it having been produced by pressure.

Mineral deposits and rock masses designated with reference to their origin; as, the siliceous formation about geysers; alluvial formations; marine formations.

A kind of mineral of the spinel group.

containing them, accumulate by being washed down from the hills, and thus indicate to the miners the locality of the veins.

A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.