phonolite

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fonolit
English - English
a light-coloured rock of volcanic origin composed mostly of alkali feldspars
Thin slabs give a ringing sound when struck; called also clinkstone
{i} clinkstone, fine-grained igneous rock; light-colored volcanic rock composed mainly of feldspars (Geology)
A compact, feldspathic, igneous rock containing nephelite, haüynite, etc
phonolite
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