pinacoid
crystallography
Quick Summary
In crystallography, a pinacoid is a crystal form characterized by two parallel and opposite faces. These faces are parallel to two of the principal crystallographic axes. A specific type, the clinopinacoid, has planes parallel to the inclined and vertical axes in a monoclinic crystal. The term "pinacoidal" describes a crystal class that possesses only a center of symmetry, typically found in the triclinic system.1234
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