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Mineralogy. a black tourmaline.
a black tourmaline consisting of a borosilicate of sodium, iron, and aluminium. Formula: NaFe3B3Al3(Al3Si6O27)(OH)4


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  • Schott

    schott (shŏt) See shott.

  • Schottky-defect

    [shot-kee] /ˈʃɒt ki/ noun, Crystallography. 1. an unoccupied position in a crystal lattice caused by the relocation of an atom or ion from the interior to the surface of the crystal. Schottky defect /ˈʃɒtkɪ/ noun 1. (physics) a crystal defect in which vacancies exist in the lattice

  • Schottky effect

    noun 1. (physics) a reduction in the energy required to remove an electron from a solid surface in a vacuum when an electric field is applied to the surface

  • Schottky-noise

    noun, Electronics. 1. shot effect. Schottky noise noun 1. another name for shot noise

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