hemiprismn.
/ˈhɛmɪprɪz(ə)m/ Crystallography.
A pair of parallel faces, parallel to the vertical axis of the crystal in the triclinic system (in which two such pairs constitute a prism).
ΘΚΠ
the world > matter > chemistry > crystallography (general) > crystal (general) > crystals (other miscellaneous) > [noun] > crystal faces
plane1671
hemiprism1864
hemidome1868
pedion1899
1864 J. D. Dana in Webster's Amer. Dict. Eng. Lang. Hemiprism, a form, in the monoclinic and triclinic systems of crystallization, that comprises but one face of a prism and its opposite.
1882 A. H. Green Geol. for Students: Physical Geol. (ed. 3) 70 The prisms will be Hemiprisms.
Derivatives
hemipriˈsmatic adj. of the nature of a hemiprism.
ΘΚΠ
the world > matter > chemistry > crystallography (general) > crystal (general) > crystal habit > [adjective] > prismatic > hemiprismatic
hemiprismatic1837
1837 J. D. Dana Min. (1844) 324 Hemi-prismatic Kouphone-Spar.
1879 F. Rutley Study of Rocks x. 87 In both systems there are hemiprismatic cleavages.
This entry has not yet been fully updated (first published 1898; most recently modified version published online September 2019).
<
n.1837