pinacoid
pinacoid Applied to a crystal face which cuts the vertical c (or z) crystallographic axis and is parallel to the horizontal a (or x) and b (or y) axes. A horizontal plane of symmetry (see CRYSTAL SYMMETRY) repeats the face at the opposite end of the crystal. The resulting form is a pair of parallel faces with the index (001).
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Boole, George
(b. Lioncoln, England, 1815; d. Cork, Ireland, 1864)
mathematics.
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