A crystalline form in mineralogy where only half of the faces of a full pyramid are present, due to the crystal's symmetry.
From 'hemi-' (half) plus 'pyramid' from Greek 'pyramis'. A technical term in crystallography for describing mineral crystal shapes.
Diamonds and quartz crystals grow into precise geometric shapes determined by how atoms bond—a hemipyramid is when atoms can only build on one side, making a crystal that's literally half a pyramid!
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