merohedral

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merohedral
merohedral, a. Cryst. (mɛrəʊˈhiːdrəl) [f. mero-1 + Gr. ἕδρα seat, base + -al1.] Of a crystal: Having less than the full number of faces admitted by the type of symmetry to which it belongs. So meroˈhedric a. in the same sense (Webster Suppl. 1902); meroˈhedrism, the property of being merohedral.1888... Oxford English Dictionary
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merihedral
merihedral, -hedric, -hedrism incorrect forms (in recent Dicts.) of merohedral, -ic, -ism. Oxford English Dictionary
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Sheldrickite
the crystal structure, it was shown that the actual symmetry of sheldrickite is trigonal, space group P32 and the pseudohexagonal symmetry is due to merohedral wikipedia.org
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merosymmetry
merosymmetry Cryst. (mɛrəʊˈsɪmɪtrɪ) [f. mero-1 + symmetry.] The condition or quality of being merohedral. So merosyˈmmetrical a. = merohedral.1875 Chem. News 19 Mar. 121 Such partially developed forms Mr. Maskelyne designated as mero-symmetrical forms. Ibid., The varieties of mero-symmetry that a cr... Oxford English Dictionary
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Crystal twinning
Merohedral twinning occurs when the lattices of the contact twins superimpose in three dimensions, such as by relative rotation of one twin from the other wikipedia.org
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mero-
▪ I. mero-1 (ˈmɛrəʊ) before a vowel mer-, combining form of Gr. µέρος ‘part, fraction’, occurring in various scientific and technical terms; sometimes opposed to holo-. In terms of Crystallography (merohedral, merosymmetry, etc.), it denotes that a crystal or crystalline form is deficient in the num... Oxford English Dictionary
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