JASPER n.
f red, yellow, and other dull colors, breaking with a smooth surface. It admits of a high polish, and is used for vases, seals, snuff boxes, etc. When the colors are in stripes or bands, it is called striped or banded jasper. The Egyptian pebble is a brownish yellow jasper. Jasper opal, a yellow variety of opal resembl…
JET n.
riety of lignite, of a very compact texture and velvet black color, susceptible of a good polish, and often wrought into mourning jewelry, toys, buttons, etc. Formerly called also black amber. Jet ant (Zoöl.), a blackish European ant (Formica fuliginosa), which builds its nest of a paperlike material in the trunks of t…
LAP n. 2 definitions
A piece of brass, lead, or other soft metal, used to hold a cutting or polishing powder in cutting glass, gems, and the like, or in polishing cutlery, etc. It is usually in the form of wheel or disk, which revolves on a vertical axis. Lap joint, a joint made by one layer, part, or piece, overlapping another, as in the…
LEAD n.
etallic lead, due to lead poisoning. (b) (Naut.) A sounding line. -- Lead mill, a leaden polishing wheel, used by lapidaries. -- Lead ocher (Min.), a massive sulphur-yellow oxide of lead. Same as Massicot. -- Lead pencil, a pencil of which the marking material is graphite (black lead). -- Lead plant (Bot.), a low l…
MARBLE n.
A massive, compact limestone; a variety of calcite, capable of being polished and used for architectural and ornamental purposes. The color varies from white to black, being sometimes yellow, red, and green, and frequently beautifully veined or clouded. The name is also given to other rocks of like use and appearance,…