A crystal form that is half a prism, created when a prism is cut or divided by a plane of symmetry.
From Greek 'hemi-' (half) and 'prism', a crystallographic term developed in the 19th century to describe symmetry variations in mineral structures.
When crystallographers look at minerals under microscopes, hemiprisms are like nature's way of playing with geometric rules—the same crystal can appear different depending on which plane of symmetry you're looking at!
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