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A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia. A conglomerate, therefore, is simply gravel bound together by a cement. Lyell.

ch stretches to allow the boot to be drawn on and off. [U.S.] -- Congress water, a saline mineral water from the Congress spring at Saratoga, in the State of New York.

Capable of being converted; susceptible of change; transmutable; transformable. Minerals are not convertible into another species, though of the same genus. Harvey.

A mineral consisting principally of sulphate of iron; white copperas; -- so called because found in the province of Coquimbo, Chili.

A mineral substance or petrifaction, in the form of coral.

A smokeless powder composed of nitroglycerin, guncotton, and mineral jelly, and used by the British army and in other services. In making it the ingredients are mixed into a paste with the addition of acetone and pressed out into cords (of various diameters) resembling brown twine, which are dried and cut to length. A…

A miner's underground working time or shift. Raymond.

The process by which miners seek to discover metallic lodes. It consist in sinking small pits through the superficial deposits to the solid rock, and then driving from one pit to another across the direction of the vein, in such manner as to cross all the veins between the two pits.

A miner's luncheon. [Cant] Raymond.

e who passes a rigorous or captious judgment; one who censures or finds fault; a harsh examiner or judge; a caviler; a carper. When an author has many beauties consistent with virtue, piety, and truth, let not little critics exalt themselves, and shower down their ill nature. I. Watts. You know who the critics are the…

A mineral occuring in silky fibers of a lavender blue color. It is related to hornblende and is essentially a silicate of iron and soda; -- called also blue asbestus. A silicified form, in which the fibers penetrating quartz are changed to oxide of iron, is the yellow brown tiger-eye of the jewelers.…

A mineral consisting principally of silicate of iron, and crystallizing in hexagonal prisms with perfect basal cleavage; -- so named from the Swedish mineralogist Cronstedt.

Indistinctly crystalline; -- applied to rocks and minerals, whose state of aggregation is so fine that no distinct particles are visible, even under the microscope.

A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc.…

Mineral coal that is not bituminous; anthracite, especially when found in small masses.

A mineral occuring in thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium. [Written also kyanite.]

A concretion of mineral matter within a leaf or other part of a plant.

A mineral occuring in octahedral crystals, also massive, of a reddish color. It is a silicate of iron, zinc manganese, and glicinum, containing sulphur.

A supposed rare element, said to be associated with cerium, yttrium, etc., in the mineral samarskite, and more recently called samarium. Symbol Dp. See Samarium.

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.