The name of a group of minerals, usually of a green color and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia.
Any of a group of hydrated silicates containing aluminum and iron. Green in color. Derived from augite, hornblende, or biotite. Resembles mica in appearance but the flakes are not as elastic.
A group of platy, monoclinic, usually greenish minerals. They are widely distributed in low grade metamorphic rocks. Associated with and resemble the micas.
a dark-green mica mineral, usually formed during metamorphism at low temperatures and pressures.
a generally green or black mineral; it occurs as a constituent of many rocks typically in the form of a flat crystal
A commonly occurring clay mineral.
(Mg,Fe,Al) Al,Si) 10(OH). A metamorphic mineral that forms at relatively low pressures and temperatures. It can also form through hydrothermal alteration of other iron- and magnesium-bearing minerals.
Family of platy silicate minerals containing various amounts of magnesium, iron, aluminum, water, and small amounts of other elements. Some mineralogists include chorites in the mica family because the crystals form small flakes. Commonly green.
A dark green, soft, flaky mineral similar to mica; it is common as an alteration or metamorphic mineral formed from ferromagnesium minerals.
platey iron-magnesium silicate, typically formed during alteration by other minerals at low temperatures
a nonexpanding clay mineral having a silica tetrahedral, an alumina octahedral, a silica tetrahedral, and a magnesium hydroxide (brucite) octahedral layer, has a 2:2 or 2:1:1 crystal structure.
A group of minerals that may be formed by regional metamorphism, or by hydrothermal alteration related to a base and/or precious metal mineralization.
A representative of a group of greenish silicate clay minerals;
Widespread group of layer silicate minerals composed of hydrous aluminum silicates, usually of magnesium and iron. Chlorites characteristically occur as alteration products of other higher temperature minerals and are most common in sedimentary and igneous rocksand in some metamorphic rocks.