What is a scalenohedron in mineralogy ?

Scalenohedron: definition

A scalenohedron is a closed polyhedron composed of 8 or 12 faces in the form of a scalene triangle (3 sides of unequal lengths), assembled in symmetrical pairs. A distinction is made between the tetragonal or orthorhombic scalenohedron, with 2 pairs of upper faces and 2 pairs of lower faces, and the hexagonal or ditrigonal scalenohedron, with 3 pairs in each hemisphere.

Photo : calcite scalenohedron from Fengjiashan Mine, Daye Co., Huangshi, Hubei, China

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