DIAMETER n.
line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve.
FLUORITE n.
white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor.
GLANCE n.
alt, cobaltite, or gray cobalt. -- Glance copper, c -- Glance wood, a hard wood grown in Cuba, and used for gauging instruments, carpenters' rules, etc. McElrath.