Glossary of Terms


Imaginary line drawn through the center of an object, either horizontally or vertically. In the case of minerals, it is used to determine if and how a crystal has symmetry. The horizontal axis is known as the x axis, and the vertical axis as the y axis. Axis lines are usually drawn as dotted lines.

This Crystal shows the Axis of Each of its 3 Dimensions.

Crystals kindly provided by Smorf


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