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Phonolite or clinkstone is a volcanic rock, consisting essentially of nepheline and sanidine feldspar. It usually also contains some form of augite, hornblende or biotite.
 Research Phonolite
Sanidine is a clear, glassy, often cracked variety of orthoclase feldspar, which is confined to modern volcanic rocks, such as trachyte, rhyolite and phonolite. It is found in the Rhine, Italy and Hungary.
Research Sanidine
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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