syenitic gneiss
Gneiss Gneiss (n[imac]s), n. [G.] (Geol.) A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called {hornblendic gneiss} or {syenitic gneiss}. Similar varieties of related rocks are also called gneiss. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Gneiss — (n[imac]s), n. [G.] (Geol.) A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende… …   The Collaborative International Dictionary of English

  • Syenitic granite — Granite Gran ite (gr[a^]n [i^]t), n. [It. granito granite, adj., grainy, p. p. of granire to make grainy, fr. L. granum grain; cf. F. granit. See {Grain}.] (Geol.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and… …   The Collaborative International Dictionary of English

  • hornblendic gneiss — Gneiss Gneiss (n[imac]s), n. [G.] (Geol.) A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags …   The Collaborative International Dictionary of English

  • Gneissoid granite — Granite Gran ite (gr[a^]n [i^]t), n. [It. granito granite, adj., grainy, p. p. of granire to make grainy, fr. L. granum grain; cf. F. granit. See {Grain}.] (Geol.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and… …   The Collaborative International Dictionary of English

  • Granite — Gran ite (gr[a^]n [i^]t), n. [It. granito granite, adj., grainy, p. p. of granire to make grainy, fr. L. granum grain; cf. F. granit. See {Grain}.] (Geol.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and usually of a… …   The Collaborative International Dictionary of English

  • Granite ware — Granite Gran ite (gr[a^]n [i^]t), n. [It. granito granite, adj., grainy, p. p. of granire to make grainy, fr. L. granum grain; cf. F. granit. See {Grain}.] (Geol.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and… …   The Collaborative International Dictionary of English

  • Graphic granite — Granite Gran ite (gr[a^]n [i^]t), n. [It. granito granite, adj., grainy, p. p. of granire to make grainy, fr. L. granum grain; cf. F. granit. See {Grain}.] (Geol.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and… …   The Collaborative International Dictionary of English

  • Hornblende granite — Granite Gran ite (gr[a^]n [i^]t), n. [It. granito granite, adj., grainy, p. p. of granire to make grainy, fr. L. granum grain; cf. F. granit. See {Grain}.] (Geol.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and… …   The Collaborative International Dictionary of English

  • Porphyritic granite — Granite Gran ite (gr[a^]n [i^]t), n. [It. granito granite, adj., grainy, p. p. of granire to make grainy, fr. L. granum grain; cf. F. granit. See {Grain}.] (Geol.) A crystalline, granular rock, consisting of quartz, feldspar, and mica, and… …   The Collaborative International Dictionary of English

  • Heulandite — is the name of a series of tecto silicate minerals of the zeolite group. Prior to 1997, heulandite was recognized as a mineral species, but a reclassification in 1997 by the International Mineralogical Association changed it to a series name,… …   Wikipedia

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