spar n. Min. An old name for a nonmetallic mineral, usually cleavable and somewhat lustrous; as, calc spar, or calcite, fluor spar, etc. It was especially used in the case of the gangue minerals of a metalliferous vein.
Blue spar, Cube spar, etc. See under Blue, Cube, etc.
◄ ►
Cube n.
1. Geom. A regular solid body, with six equal square sides.
2. Math. The product obtained by taking a number or quantity three times as a factor; as, 4x4=16, and 16x4=64, the cube of 4.
Cube ore Min., pharmacosiderite. It commonly crystallizes in cubes of a green color.
Cube root. Math., the number or quantity which, multiplied into itself, and then into the product, produces the given cube; thus, 3 is the cube root of 27, for 3x3x3 = 27.
Cube spar Min., anhydrite; anhydrous calcium sulphate.