Difference between revisions of "Crystal (mineral)"
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== Authority == | == Authority == | ||
| − | * | + | * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 |
| − | * | + | * Walter C. McCrone, John Gustave Delly, ''The Particle Atlas'', W. McCrone Associates, Chicago, IV, 1972 |
* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | * ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | ||
Revision as of 07:40, 24 July 2013
Description
A solid material that exists as a 3-dimensional arrangement of atoms, ions or molecules in repeating patterns. Based on the orientation and positions of the repeating units, crystals are grouped into six systems: 1) isometric (cubic) - three perpendicular axes of equal length 2) tetragonal - three perpendicular axes, two of equal length 3) orthorhombic - three perpendicular axes of different lengths 4) monoclinic - three axes of different lengths, two perpendicular 5) triclinic - three axes of different lengths, none perpendicular 6) hexagonal - three symmetrically spaced axes in one plane with a fourth axes that extends perpendicular to the first three. The morphology of a crystal affects its optical properties such as index of refraction, color and birefringence.
Synonyms and Related Terms
crystals; cristal (Esp., Fr., Port.); Kristall (Deut.); kristal (Ned.)
Authority
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000