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pseudohexagonal
pseudohexagonal adj. 
/ˌs(j)uːdə(ʊ)hɛkˈsaɡn̩l/,
Brit. /ˌs(j)uːdə(ʊ)hɛkˈsaɡənl/
, /ˌs(j)uːdə(ʊ)hɛkˈsaɡənl//ˌs(j)uːdə(ʊ)hɛkˈsaɡn̩l/U.S. /ˌsudoʊˌhɛkˈsæɡən(ə)l/
Crystallography apparently hexagonal in morphology or crystal structure but not actually so; spec. designating a crystal in which the crystal structure simulates the symmetry of the hexagonal system but actually has lower symmetry./ˌsudoʊˌhɛkˈsæɡən(ə)l/ΚΠ
1885 Amer. Naturalist 19 300 This pseudohexagonal core is surrounded by an external layer of the really hexagonal modification.
1895 N. Story-Maskelyne Crystallogr. vii. §308 Fig. 261 represents a crystal of witherite, and illustrates the pseudo-hexagonal aspect of many crystals in this [orthorhombic] system.
1969 Amer. Mineralogist 54 849 Thin pseudohexagonal flakes or fragments.
1990 C. Pellant Rocks, Minerals & Fossils 89/1 Chlorite... System: Monoclinic. Habit: flaky, pseudohexagonal crystals, massive.
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