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- ==Quartzite and Chert== Quartzite and [[chert]], like quartz, can come in clear and white varieties, which are relatively707 bytes (98 words) - 20:26, 27 June 2019
- * [[silicon dioxide]] occurs as the minerals [[quartz]] (and [[flint]], [[chert]], [[sand]], etc.)1 KB (169 words) - 16:23, 27 June 2019