In crystallography, a type of crystal form with eight faces arranged as two symmetrical pyramids back-to-back.
From dis- (meaning 'two') + sphenoid (from Greek sphenoeides, from sphene 'wedge'). Describes a crystal form shaped like two opposing wedges.
Tetragonal disphenoids appear in nature in certain minerals, and understanding these crystal shapes helped scientists decode molecular structures before X-ray crystallography became standard.
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