This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
[Ger.] The name of a species of rock closely resembling granite. Like granite, it is composed Of mica, quartz, and feldspar, but in separate layers. Its texture varies from a fine-grained rock up to a coarse crystalline.
 
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