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quartz graywacke |
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quartz graywacke [′kwȯrts ′grā‚wak·ə]
(petrology) A graywacke containing abundant grains of quartz and chert and less than 10% each of feldspars and rock fragments. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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