hemimorphic


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hem·i·mor·phic

 (hĕm′ĭ-môr′fĭk)
adj.
Asymmetric at the axial ends. Used of a crystal.

hemimorphic

(ˌhɛmɪˈmɔːfɪk)
adj
(Chemistry) (of a crystal) having different forms at each end of an axis
ˌhemiˈmorphism, ˈhemiˌmorphy n

hem•i•mor•phic

(ˌhɛm ɪˈmɔr fɪk)

adj.
(of a crystal) having the two ends of an axis unlike in their planes or modifications; lacking a center of symmetry.
[1860–65]
hem`i•mor′phism, hem′i•mor`phy, n.
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References in periodicals archive ?
Hemimorphic topaz crystals (though common in the Ouro Preto deposits) and twins are unknown from Schneckenstein.
If a crystal with this symmetry is attached to the matrix with its (001) face, then a polar hemimorphic symmetry corresponding to a point group 3m results.
Some crystals appear hemimorphic, exhibiting pyramidal modifications on only one side of the tablet, and a larger flat c face on the other.
The crystals measure up to 10 cm and have distinctive hemimorphic habits, with one end of the hexagonal prism terminated by either {10-12} or {02-21} pyramidal faces, the other termination exhibiting bundles of elongated acicular crystals, resembling an extended trigonal "Mercedes Benz" emblem.
Crystals are typically hexagonal pyramidal and hemimorphic, in some cases with prism faces, and sometimes grouped interestingly in cyclic "tetrapod" twins on (10[bar.
Weloganite crystals (5) are characteristically strongly striated or grooved due to pronounced oscillatory growth along [001], and most are distinctly hemimorphic.
This phenomenon is related to the hemimorphic nature of tourmaline, making the surface of one termination more susceptible to dissolution than the other.
When doubly terminated (as they very frequently are) the crystals display the hemimorphic nature of tourmaline-group species: on one end, a perfectly flat basal pinacoid face, with matte luster, and on the other, three rhombohedral (trigonal) faces with glassy luster.