dacite

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  • noun

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a grey volcanic rock containing plagioclase and quartz and other crystalline minerals

References in periodicals archive ?
A number of rhyolite or dacite bodies were intersected that may be the sources of the CSAMT anomalies targeted.
This series, interpreted as a calc-alkaline continental-type volcano-sedimentary unit (Andean-type), exhibits bimodal volcanism, with basalts, andesites, dacites and rhyolites.
The mineralization occurs in dacites and dacite porphyries intruding a fine grain granite and is associated with breccia dikes, crackle breccias and stockwork veining.
Anomalous zones feature a composite of volcanic rock types ranging from basic through intermediate andesites to acid dacites and rhyolites.
The property is predominantly underlain by the Ambon Volcanics, a suite of Tertiary andesites, dacites, breccias and tuffs.