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ced base to base; having a pyramid at each of the extremities of a prism, as in quartz crystals.

The line bisecting the angle between the optic axes of a biaxial crystal.

One of the elements; a metal of a reddish white color, crystallizing in rhombohedrons. It is somewhat harder than lead, and rather brittle; masses show broad cleavage surfaces when broken across. It melts at 507º Fahr., being easily fused in the flame of a candle. It is found in a native state, and as a constituent of…

A white, crystalline, nitrogenous substance, C2O2N3H5, formed by heating urea. It is intermediate between urea and cyanuric acid.

To bleach by excluding the light, as the stalks or leaves of plants, by earthing them up or tying them together.

ay; merry; sprightly; joyous; glad; cheerful; as, a blithe spirit. The blithe sounds of festal music. Prescott. A daughter fair, So buxom, blithe, and debonair. Milton.

does. G. Eliot. To blow upon. (a) To blast; to taint; to bring into discredit; to render stale, unsavory, or worthless. (b) To inform against. [Colloq.] How far the very custom of hearing anything spouted withers and blows upon a fine passage, may be seen in those speeches from [Shakespeare's] Henry V. which are curre…

Stale; worthless.

ue verditer. See Verditer. -- Blue vitriol (Chem.), sulphate of copper, a violet blue crystallized salt, used in electric batteries, calico printing, etc. -- Blue water, the open ocean. -- To look blue, to look disheartened or dejected. -- True blue, genuine and thorough; not modified, nor mixed; not spurious; spec…

A place or stand for the sale of books in the streets; a bookstall.

A stall or a crib for an ox, cow, or other animal. [Prov. Eng.] Halliwell.

A covered stall or temporary structure in a fair or market, or at a polling place.

A mineral of a white or gray color occurring massive and in isometric crystals; in composition it is a magnesium borate with magnesium chloride.

A white or gray crystalline salt, with a slight alkaline taste, used as a flux, in soldering metals, making enamels, fixing colors on porcelain, and as a soap. It occurs native in certain mineral springs, and is made from the boric acid of hot springs in Tuscany. It was originally obtained from a lake in Thibet, and wa…

Of, pertaining to, or containing, boron. Boric acid, a white crystalline substance B(OH)3, easily obtained from its salts, and occurring in solution in the hot lagoons of Tuscany.

a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic weight 10.9. Symbol B.

Imperfectly crystallized or coarse diamonds, or fragments made in cutting good diamonds which are reduced to powder and used in lapidary work.

A mineral of a steel-gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of antimony, lead, and copper.

s of a rhombic prism. Brachydiagonal axis, the shorter lateral axis of an orthorhombic crystal.

A plane of an orthorhombic crystal which is parallel both to the vertical axis and to the shorter lateral (brachydiagonal) axis.