Crystallography. Designating a fundamental crystalline form or structural unit from which all others may be derived geometrically (originally a…
单词 | θ70623 |
释义 | the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [adjective] > miscellaneous other (10) primitive1807 Crystallography. Designating a fundamental crystalline form or structural unit from which all others may be derived geometrically (originally a… subtractive1807 In various specific contexts. Crystallography. Designating a group of atoms within a crystal which form a parallelepiped composed of tetrahedrons… based1810 Crystallography. In Haüy's nomenclature: designating minerals displaying truncated bipyramidal or rhomboidal forms with terminal facets perpendicular… emarginated1816 = emarginate, adj. planoconvex1816 spec. Of a crystal: having some faces plane and others convex. Obsolete. rare. primary1823 Crystallography. = primitive, adj. 10. Cf. secondary, adj. 3i. Obsolete. hemisystematic1878 (See quot.) face-centred1913 designating a space lattice whose points occur at the centres of the faces and at the corners of unit cells; (of a crystal, substance, etc.) having… body-centred1918 designating a lattice structure in which an atom or ion occurs at each corner and in the centre of a cubic unit cell; having such a structure; cf. fa… mosaic1934 Crystallography. Characterized by or relating to small blocks of perfect lattices set at very slight angles to one another. |
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