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A mineral of a red, or brownish or yellowish red color. It is a chromate of lead; -- called also phoenicocroite.

A mineral occurring in small yellow crystals, found in the lavas (melilite basalt) of Vesuvius, and elsewhere. [Written also mellilite.]

A mineral of a honey color, found in brown coal, and partly the result of vegetable decomposition; honeystone. It is a mellitate of alumina.

Pertaining to, or derived from, the mineral mellite. Mellitic acid (Chem.), a white, crystalline, organic substance, C6(CO2H)6, occurring naturally in combination with aluminium in the mineral mellite, and produced artificially by the oxidation of coal, graphite, etc., and hence called also graphitic acid.…

An iron-black or steel-gray mineral, consisting chiefly of the oxides of iron and titanium. It is commonly massive, but occurs also in rhombohedral crystals. Called also titanic iron ore, and ilmenite.

The process or operation of obtaining the mercury, in its fluid form, from mercuric minerals.

To obtain mercury from, as mercuric minerals, which may be done by any application of intense heat that expels the mercury in fumes, which are afterward condensed. [R.]

A zeolitic mineral, grayish white or yellowish, occuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda.

Ore from which a metal is derived; -- so called by miners. Raymond.

Pertaining to, produced by, or exhibiting, certain changes which minerals or rocks may have undergone since their original deposition; -- especially applied to the recrystallization which sedimentary rocks have undergone through the influence of heat and pressure, after which they are called metamorphic rocks.…

An alteration in a mineral or rock mass when involving a chemical change of the substance, as of chrysolite to serpentine; -- opposed to ordinary metamorphism, as implying simply a recrystallization. -- Met`a*so*mat"ic, a.

A mineral of an iron-black color, and very sectile, consisting principally of sulphur, antimony, and silver.

The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in composition, and vary in color from pale brown or yellow to green or black. The transparent forms are used in lanterns, the doors of stoves, etc., be…

A mineral of the feldspar group, like orthoclase or common feldspar in composition, but triclinic in form.

A rare mineral of resinous luster and high specific gravity. It is a tantalate of calcium, and occurs in octahedral crystals usually very minute.

ies of cells, in which the milky juice is contained. See Latex. -- Rock milk. See Agaric mineral, under Agaric. -- Sugar of milk. The sugar characteristic of milk; a hard white crystalline slightly sweet substance obtained by evaporation of the whey of milk. It is used in pellets and powder as a vehicle for homeopath…

A mineral occurring in pale yellow or brownish hexagonal crystals. It is an arseniate of lead.

; to get ore, metals, coal, or precious stones, out of the earth; to dig in the earth for minerals; to dig a passage or cavity under anything in order to overthrow it by explosives or otherwise.

In the University of Oxford, an examiner for moderations; at Cambridge, the superintendant of examinations for degrees; at Dublin, either the first (senior) or second (junior) in rank in an examination for the degree of Bachelor of Arts.

A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.