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Erythrite :: Erythrite (n.) A rose-red mineral, crystallized and earthy, a hydrous arseniate of cobalt, known also as cobalt bloom; -- called also erythrin or erythrine..

Glauconite :: Glauconite (n.) The green mineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See Greensand.

Geode :: Geode (n.) A nodule of stone, containing a cavity, lined with crystals or mineral matter..

Spar :: Spar (n.) An old name for a nonmetallic mineral, usually cleavable and somewhat lustrous; as, calc spar, or calcite, fluor spar, etc. It was especially used in the case of the gangue minerals of a metalliferous vein..

Dendrite :: Dendrite (n.) A stone or mineral on or in which are branching figures resembling shrubs or trees, produced by a foreign mineral, usually an oxide of manganese, as in the moss agate; also, a crystallized mineral having an arborescent form, e. g., gold or silver; an arborization..

Idiomorphous :: Idiomorphous (a.) Apperaing in distinct crystals; -- said of the mineral constituents of a rock.

Philippium :: Philippium (n.) A rare and doubtful metallic element said to have been discovered in the mineral samarskite.

Paragenesis :: Paragenesis (n.) The science which treats of minerals with special reference to their origin.

Talc :: Talc (n.) A soft mineral of a soapy feel and a greenish, whitish, or grayish color, usually occurring in foliated masses. It is hydrous silicate of magnesia. Steatite, or soapstone, is a compact granular variety..

Paramorphism :: Paramorphism (n.) The change of one mineral species to another, so as to involve a change in physical characters without alteration of chemical composition..

Tungsten :: Tungsten (n.) A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18..

Yttriferous :: Yttriferous (a.) Bearing or containing yttrium or the allied elements; as, gadolinite is one of the yttriferous minerals..

Mineralogize :: Mineralogize (v. i.) To study mineralogy by collecting and examining minerals.

Ludlamite :: Ludlamite (n.) A mineral occurring in small, green, transparent, monoclinic crystals. It is a hydrous phosphate of iron..

Microlite :: Microlite (n.) A minute inclosed crystal, often observed when minerals or rocks are examined in thin sections under the microscope..

Vichy Water :: Vichy water () A mineral water found at Vichy, France. It is essentially an effervescent solution of sodium, calcium, and magnetism carbonates, with sodium and potassium chlorides; also, by extension, any artificial or natural water resembling in composition the Vichy water proper. Called also, colloquially, Vichy..

Calx :: Calx (n.) The substance which remains when a metal or mineral has been subjected to calcination or combustion by heat, and which is, or may be, reduced to a fine powder..

Pocket :: Pocket (n.) A cavity in a rock containing a nugget of gold, or other mineral; a small body of ore contained in such a cavity..

Jamesonite :: "Jamesonite (n.) A steel-gray mineral, of metallic luster, commonly fibrous massive. It is a sulphide of antimony and lead, with a little iron..

Parting :: Parting (n.) Lamellar separation in a crystallized mineral, due to some other cause than cleavage, as to the presence of twinning lamellae..

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