plagiohedral
adjective
pla·gi·o·he·dral
¦plājēō¦hēdrəl
variants
or plagihedral
-jə¦-
: having an oblique spiral arrangement of faces : gyroidal
plagiohedral quartz crystals
specifically
: being a group of the isometric system characterized by 13 axes of symmetry but no center or planes
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Merriam-Webster unabridged
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