Corundum: alternatives and connections

A compact variety or sulphate of lime, or gypsum, of fine texture, and usually white and translucent, but sometimes yellow, red, or gr…

The common red variety of garnet.

Radiated, with diverging rays; as, asteriated sapphire.

A constellation.

A variety of spinel ruby, of a pale rose red, or inclining to orange. See Spinel.

A ferruginous hydrate of alumina. It is largely used in the preparation of aluminium and alumina, and for the lining of furnaces which…

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.

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 beautiful gem of a deep red color (with a mixture of scarlet) called by the Greeks anthrax; found in the East Indies. When held up t…

Native blue vitriol. See Blue vitriol, under Blue.

Native sulphate of copper. Cf. Blue vitriol, under Blue.

A dark blue, edible berry with a white bloom, and its shrub (Gaylussacia frondosa) closely allied to the common huckleberry. The bush…

A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime,…

A bud.

Of a sea-green color; of a dull green passing into grayish blue.

A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, c…

A blue isometric mineral, characteristic of some volcani/ rocks. It is a silicate of alumina, lime, and soda, with sulphate of lime.