clinochlore

mineral

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June 24, 2026

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Clinochlore is a mineral belonging to the chlorite group, characterized by its typical green color. It is a hydrous aluminum silicate, often containing magnesium and iron, with a chemical formula near (Mg,Fe,Al)₃(Si,Al)₂O₅(OH)₄. Clinochlore is specifically a magnesium-rich chlorite.12

Chlorites, as a group, are widespread layer silicate minerals. They are commonly found as alteration products of other minerals and are significant rock-forming constituents in various metamorphic rocks, such as greenschists. The structure of chlorite minerals involves alternating mica-like layers and hydroxide sheets, making them relatively stable at high temperatures.23

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chlorite
The accepted names are: clinochlore (Mg-rich chlorite), chamosite (Fe-rich), nimite (Ni-rich), and pennantite (Mn-rich). Adjectival modifiers are used to indicate compositional variations. Cookeite (with lithium substituted for aluminum) is also a member of the chlorite group.
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The accepted names are: clinochlore (Mg-rich chlorite), chamosite (Fe-rich), nimite (Ni-rich), and pennantite (Mn-rich). Adjectival modifiers are used to indicate compositional variations. Cookeite (with lithium substituted for aluminum) is also a member of the chlorite group.
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