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A heavy solid line marking a mirror.
Also known as: Reflection plane symbol, Mirror line crystallography, m plane symbol
The graphical symbol for a mirror plane on a crystallographic space group diagram, drawn as a solid bold line.
Marks a mirror plane, a plane across which the structure is reflected onto itself.
Contexts: Laboratory
Is drawn solid to distinguish it from the glide planes, which carry the same idea with a translation added and are drawn broken.
Contexts: Laboratory
A heavy unbroken straight line drawn across the diagram, thicker than the cell edges it crosses.