Spinelle: alternatives and connections

A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in…

A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, general…

Exhibiting or producing two colors, as substances which in the color test may change red litmus to blue and blue litmus to red.

A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surface. It i…

A mineral of great hardness, and, when transparent, of much beauty. It occurs in hexagonal prisms, commonly of a green or bluish green…

A pale blue pigment, prepared from the native blue carbonate of copper, or from smalt; -- called also blue bice.

The blue buck. See Blue buck, under Blue.

A mineral, called also sphalerite, and by miners mock lead, false galena, and black-jack. It is a zinc sulphide, but often contains so…

Having the color of the clear sky, or a hue resembling it, whether lighter or darker; as, the deep, blue sea; as blue as a sapphire; b…

A name formerly given to various fevers occuring in tropics; esp. to a form of furious delirium accompanied by fever, among sailors, w…

Native tin dioxide; tin stone; a mineral occurring in tetragonal crystals of reddish brown color, and brilliant adamantine luster; als…

An earth of a deep brown color, containing more vegetable than mineral matter; an earthy variety of lignite, or brown coal.

The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or r…

A mineral occuring in silky fibers of a lavender blue color. It is related to hornblende and is essentially a silicate of iron and sod…

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

An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the…

A European finch (Ligurinus chloris); -- called also green bird, green linnet, green grosbeak, green olf, greeny, and peasweep.

The common black, or dark green or brown, variety of amphibole. (See Amphibole.) It belongs to the aluminous division of the species,…