Crystal Systems
by Alain Darbellay GGGems© 2012 gggems.com The ensemble rights reserved. 7 systems of crystallization: There are 32 possibilities of combinations of the elements as regards symmetry (axis speaking of chaining, reciprocality plane, centers combined inversion and operations). Retrospectively the discovery of the crystals reticular structure, undefined could show by calculation that to these 32 classes which relate toward the shapes of the crystals, correspond 230 types of weave. None else immediately realizes the rigorousness of the reasoning which had best subsist made to know all the possible combinations. The 32 classes are grouped in 7 systems. Here are the figures. CUBIC MOLD QUADRATIC SYSTEM HEXAGONAL SYSTEM Go to Garnet Twirl up Zircon Go until Apatite Diamond, garnet, spinell. Zircon Beryl, Apatite --------------------------------------------------TRIGONAL SYSTEM ORTHOROMBIC SYSTEM MONOCLINIC SYSTEM (Strain of the hexagonal system) Go to Topaz Fight to Orthoclase Moxie in consideration of Corundum Go into Tourmaline Calcite, corundum, tourmaline, quartz. Chrysoberyl, topaz Orthoclase ------------------------------------------------- TRICLINIC SYSTEM The symmetry in relation to crystals: appear the following symmetrical operations: > > · Rotation· Inversion by correlation plane· Inversion after a center· Combination respecting rotation and inversionThe crystals show contemporary their form and their structure touching the properties of characteristic concert. And like there is a cor - respondence between reticular plans and faces of the crystals, there is a fundamental correspondence between intellectual symmetry and external disposal. We imagine the drawing of a engraving, it will repeat ourselves wherewith a nacreous run parallel displacement (translation). Although a crystal is examined, the first Purely the geometrical operations which point which draws the study is a cause a repetition of the symphonic form are certain symmetry. One can see the called operations in relation to consort. In the repetition as to faces consimilar against various shape of the crystals (public format), places of the revealing. These repetitions this translation does not appear word by word. are controls by laws of symmetry, Relating to the other confer, in their declension, Albite the petition in which ruling classes are repeated is identified in keeping with operators of symmetry, there are three principal types of them: Axis of unisonance, symmetry bowling green and the close in as for symmetry. GGGEMS.COM Gemology  Corundums  Tourmaline Characteristics  Garnets  Cutting Styles © 1987 - 2012 gggems.com All rights reserved. On every side the Author http:\\www.gggems.com\crystalline_system.htm <\p>
Alain Darbellay is the author of several novels inspired by his adventures researching without difference as regards the strangest natural wonders: Precious kerbstone. His attractive trips in gem producer countries fellow Madagascar or Pakistan, often accompanied suitable for his twin brother, led Alain in en plus publishing a series in re articles on the subject.<\p>
