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diagenesis forms porcelanite
As crystallization progresses and various minerals are removed from the melt
With warming climate at the end of the Ice Age
kaolinite - soft white kaolin - large hand/display specimen of the primary constituent of kaolin clay depending on your browserkaolinite Al2(Si2O5)(OH)4 Kaolinite is the primary constituent of kaolin clay and is one of the kaolin group of minerals. Its physical structure is like a sandwich, with aluminum hydroxide layers, called gibbsite layers, bonded to silicate sheets. These sheets are electrically neutral, so they are bonded by very weak van de Waals forces, easily sliding apart to give kaolinite its usual softness and greasy feel. It has a similar structure to minerals
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