Gallery of Chert Rocks and Gemstones - ThoughtCo
Many types of chert fit into this categorization. 01. of 16. Flint Nodule . James St. John/Wikimedia Commons/CC BY 2.0. Chert forms in three main settings. When silica is outweighed by carbonate, as in limestone or chalk beds, it may segregate itself in lumps of tough, gray flint. These nodules may be mistaken for fossils. 02. of 16.
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