Clay minerals are hydrous aluminium phyllosilicates, sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations found on or near some planetary surfaces. Clay minerals form in the presence of water and have been important to life, and many theories of abiogenesis involve them. They have been useful to hum...
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A group of fine-grained crystalline hydrous silicates formed by weathering of minerals such as feldspar, pyroxene, or amphibole.
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Fine-grained, hydrous silicates formed by extensive weathering of other silicate minerals.
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