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

A mineral of a dark bluish color, related to amphibole. It is characteristic of certain crystalline rocks.

he free state, but is always combined, usually with silica or alumina, or both; as in the minerals phenacite, chrysoberyl, beryl or emerald, euclase, and danalite. It was named from its oxide glucina, which was known long before the element was isolated. Symbol Gl. Atomic weight 9.1. Called also beryllium. [Formerly wr…

A rhombohedral zeolitic mineral, related in form and composition to chabazite.

That part of a mine from which the mineral has been partially or wholly removed; the waste left in old workings; -- called also gob . To work the goaf or gob, to remove the pillars of mineral matter previously left to support the roof, and replace them with props. Ure.

Dutch gold, Fool's gold, Gold dust, etc. See under Dutch, Dust, etc. -- Gold amalgam, a mineral, found in Columbia and California, composed of gold and mercury. -- Gold beater, one whose occupation is to beat gold into gold leaf. -- Gold beater's skin, the prepared outside membrane of the large intestine of the ox,…

Like grease or oil; smooth; seemingly unctuous to the touch, as is mineral soapstone.

-- Green looper (Zoöl.), the cankerworm. -- Green marble (Min.), serpentine. -- Green mineral, a carbonate of copper, used as a pigment. See Greengill. -- Green monkey (Zoöl.) a West African long-tailed monkey (Cercopithecus callitrichus), very commonly tamed, and trained to perform tricks. It was introduced into…

Native cadmium sulphide, a mineral occurring in yellow hexagonal crystals, also as an earthy incrustation.

A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite.

A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.

The inclination or deviation from the vertical of any mineral vein.

A mineral consisting of the arseniate of lime; -- so named in honor of W. Haidinger, of Vienna.

A claylike mineral, occurring in soft, smooth, amorphous masses, of a whitish color.

er. -- Hard solder. See under Solder. -- Hard water, water, which contains lime or some mineral substance rendering it unfit for washing. See Hardness, 3.- Hard wood, wood of a solid or hard texture; as walnut, oak, ash, box, and the like, in distinction from pine, poplar, hemlock, etc.- In hard condition, in excelle…

dy, determined by its capacity to scratch another, or be itself scratched;-measured among minerals on a scale of which diamond and talc form the extremes.

Mineral t

Native sulphide of manganese a reddish brown or brownish black mineral.

A blue isometric mineral, characteristic of some volcani

te, -- so called because of its high specific gravity as compared with other non-metallic minerals.