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[(Mg,Al,Fe) 12(Si,Al) 8O20(OH) 16]

A platy, pale green mineral of the mica group of sheet silicates, also considered to be a type of clay mineral, found in sedimentary and low-grade metamorphic rocks. Chlorite is a common authigenic mineral lining the pores of sandstones. In some cases, the presence of authigenic chlorite on sand grains can inhibit the growth of pore-filling cements during diagenesis and preserve pore space for occupation by hydrocarbons.

See: cementglauconitehydrothermalhydrothermal alterationsandstonesedimentary