Sericite is a common alteration mineral of orthoclase or plagioclase feldspars in areas that have been subjected to hydrothermal alteration typically associated with copper, tin, or other hydrothermal ore deposits.

Sericite is grungy-looking fine-grained stuff that commonly replaces feldspars. Close examination of sericite reveals that at least some of it is fine-grained white mica. Because it is generally made up of very small crystals, its birefringence is irregular and generally low.

Sericite is produced by the alteration of orthoclase or plagioclase feldspars in areas that have been subjected to hydrothermal alteration (also see Sericitic alteration) typically associated with copper, tin, or other hydrothermal ore deposits.

Apr 23, 2023 · Sericite is a type of mica, specifically a muscovite mica. The chemical formula for sericite is KAl2(AlSi3O10)(OH)2, which means it contains potassium, aluminum, silicon, oxygen, and hydrogen. Sericite is characterized by its thin, platy structure and is usually white, gray, or pale yellow in color.

Olivines are found most commonly in mafic and ultramafic igneous rocks such as peridotites, dunites, gabbros, and basalts. Forsteritic olivines, which have 88 to 92 percent forsterite, are the dominant phase of dunites and are common in peridotites.

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Sericite is name given to very fine, ragged grains and aggregates of white mica – usually muscovite – produced by the alteration of feldspars or other minerals. Included grains of zircon or other radioactive minerals may form pale pleochroic halos in surrounding muscovite.

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These rocks are formed by crushing and shearing with only minor recrystallization. If there are no conspicuous directional features, the rock is called "crush breccia" if coarse grained and "cataclasite" if fine grained. Most of them, however, are foliate.

Mafic rocks consist mainly of clinopyroxene and plagioclase (labradorite) with accessory orthopyroxene, olivine, hornblende and biotite. Typical alteration products of these primary phases are chlorite, sericite (fine-grained muscovite), talc, serpentine, amphibole and mica.