"Gneiss" is a word in ENGLISH
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 / syenitic gneiss. Similar varieties of related
rocks are also called gneiss.
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The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin …
Read the complete definitionA mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling …
Read the complete definitionA granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. …
Read the complete definitionA group of minerals having, a micaceous structure. They are hydrous silicates, derived generally from the alteration of some kind …
Read the complete definition