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Cube spar
(gcide) | spar \spar\ (sp[aum]r), n. [AS. spaer in spaerst[=a]n
chalkstone; akin to MHG. spar, G. sparkalk plaster.] (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.
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Blue spar, Cube spar, etc. See under Blue, Cube, etc.
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Cube spar
(gcide) | Cube \Cube\ (k[=u]b), n. [F. cube, L. cubus, fr. Gr. ???? a
cube, a cubical die.]
1. (Geom.) A regular solid body, with six equal square sides.
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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.
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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.
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