Rhombic pyramid (crystallography) - mm23D ModelNoAI
Name: Rhombic pyramid
Pyramid: open form, a collection of 3, 4, 6, 8, or 12 nonparallel faces that can intersect at a point. The different types of pyramids are named based on the shape of the cross section with the same nomenclature used for prisms. A pyramid may be either top or bottom depending on whether it occurs on the top of the crystal or the bottom.
Number of faces: 5
Symmetry: 1A2, 2m. The 2-fold rotation axis coincides with the c crystallographic axis. Two mirror planes at right angles to each other intersect in this axis.
Crystal System & Class: Orthorhombic - mm2 (2mm)
Minerals: only a few minerals crystallize in this class; the most common representatives are hemimorphite and bertrandite.
Info: Play the animation to see the symmetry elements in action!
Website: http://geology.uaic.ro/muzee/mineralogie/
Concept & 3D-modelling by dr. Andrei Ionut APOPEI
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