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dacite |
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dacite [′dā‚sīt] (geology) Very fine crystalline or glassy rock of volcanic origin, composed chiefly of sodic plagioclase and free silica with subordinate dark-colored minerals. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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This fault and fracture zone is also the contact between Tertiary age strongly altered andesite and rhyolite flows which have been intruded by a dacite dike and cut by stockwork quartz veins and veinlets. A group of rock chip samples collected across two old adits excavated within a mineralized dacite dike averaged 706 grams per tonne silver (22. Three mineralization styles were sampled: 1) quartz veins from artisan workings, 2) argillically altered dacite with minor quartz veining, and 3) highly silicified unaltered dacite. |
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