Pyritohedral Pyr`i*to*he"dral, a. [See {Pyritohedron}.] (Crystallog.) Like pyrites in hemihedral form. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • pyritohedral — adjective a) having the shape of pyrites b) having the shape of a pyritohedron …   Wiktionary

  • pyritohedral — py·ri·to·he·dral …   English syllables

  • pyritohedral — pə̇|rīd.ə|hēdrəl, (|)pī|r sometimes chiefly Brit hed adjective Etymology: New Latin pyritohedron + English al : of, relating to, or consisting of pyritohedrons * * * pyritohēˈdral adjective • • • Main Entry: ↑pyrites …   Useful english dictionary

  • pyritohedron — pyritohedral, adj. /puy ruy teuh hee dreuhn, peuh , puy ruy /, n. Crystall. a crystal form of 12 pentagonal faces. Also called pentagonal dodecahedron. See diag. under dodecahedron. [1865 70; pyrito (comb. form of PYRITE) + HEDRON] * * * …   Universalium

  • Tetrahedral symmetry — A regular tetrahedron has 12 rotational (or orientation preserving) symmetries, and a total of 24 symmetries including transformations that combine a reflection and a rotation.The group of symmetries that includes reflections is isomorphic to S 4 …   Wikipedia

  • Compound of four octahedra with rotational freedom — Type Uniform compound Index UC10 Polyhedra 4 octahedra Faces 8+24 triangles …   Wikipedia

  • Sulfide minerals — ▪ Table Sulfide minerals name colour lustre Mohs hardness specific gravity habit or form fracture or cleavage refractive indices or polished section data crystal system argentite blackish lead gray metallic 2–2 1/2 7.2–7.4 cubic or octahedral… …   Universalium

  • Polyhedron — Polyhedra redirects here. For the relational database system, see Polyhedra DBMS. For the game magazine, see Polyhedron (magazine). For the scientific journal, see Polyhedron (journal). Some Polyhedra Dodecahedron (Regular polyhedron) …   Wikipedia

  • Density of states — Condensed matter physics Phases · Phase tr …   Wikipedia

  • Ullmannite — is a nickel antimony sulfide mineral with formula: NiSbS. Considerable substitution occurs with cobalt and iron in the nickel site along with bismuth and arsenic in the antimony site. A solid solution series exists with the high cobalt willyamite …   Wikipedia

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