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twinning
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Diagram showing several shapes of natural calcite crystals. The top section illustrates four untwinned crystal habits, each with different geometric forms. The bottom section displays two examples of twinned calcite crystals, highlighting how their structures differ. Red dashed lines and axes indicate symmetry and orientation. Relations between lamellar twinning and cleavage planes in dolomite and calcite. This difference can be discerned best when thin sections of the minerals are viewed under a microscope. Figure 2: Twinning in feldspars.

twinning: References & Edit History

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Article History

Type Description Contributor Date
Deleted Web site: Tulane Edu. crystal twinning. Apr 11, 2013
Added new Web site: Amethyst Galleries' Mineral Gallery - Twinning. May 29, 2009
Added new Web site: The University of Oklahoma - Crystal Twinning. Apr 16, 2009
Article revised and updated. Oct 06, 2006
Article added to new online database. Jul 20, 1998
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