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protoquartzite |
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protoquartzite [¦prōd·ō′kwȯrt‚sīt] (petrology) A well-sorted sandstone that is intermediate in composition between subgraywacke and orthoquartzite, consisting of 75-95% quartz and chert, with less than 15% detrital clay matrix and 5-25% unstable materials in which there is a greater abundance of rock fragments than feldspar grains. Also known as quartzose subgraywacke. 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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