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. 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.

Look at other dictionaries:

  • 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 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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”