berylloid

noun
ber·​yl·​loid | \ ˈber-ə-ˌlȯid\
plural -s

Definition of berylloid 

: a form consisting of a double 12-sided pyramid : the dihexagonal dipyramid

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History and Etymology for berylloid

International Scientific Vocabulary beryll- (probably from Latin beryllus) + -oid; from the frequent occurrence of beryl crystals in this form

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