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rhyolite
Definitions
[ˈrʌɪəlʌɪt], (Noun)
Definitions:
- a pale fine-grained volcanic rock of granitic composition, typically porphyritic in texture
Phrases:
Origin
:
mid 19th century: from German Rhyolit, from Greek rhuax ‘lava stream’ + lithos ‘stone’
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definition by Oxford Dictionaries