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The green color of many igneous rocks, slates, and schists is due to fine particles of chlorite disseminated throughout the rock. [10] Chlorite is a common weathering product and is widespread in clay and in sedimentary rock containing clay minerals. [9]
Chlorite group includes a wide variety of similar minerals with considerable chemical variation. [21] Other 2:1 clay types exist such as palygorskite (also known as attapulgite) and sepiolite, clays with long water channels internal to their structure. Mixed layer clay variations exist for most of the above groups. [9]
It is normally found as dark green rounded concretions with the dimensions of a sand grain. It can be confused with chlorite (also of green color) or with a clay mineral. Glauconite has the chemical formula (K,Na)(Fe,Al,Mg) 2 (Si,Al) 4 O 10 (OH) 2.
The green color is due to the large development of chlorite. Among the crystalline schists of many regions, green beds or green schists occur, which consist of quartz, hornblende, chlorite or biotite, iron oxides, feldspar, etc., and are probably recrystallized or metamorphosed tuffs.
The primary minerals in the Cleveland Shale are chlorite, ... in color. In exposed outcrops, it weathers to red, [9] reddish-brown, [2] or medium brown. [4] ...
Greenschist is defined by the presence of the minerals chlorite, epidote, or actinolite, which give the rock its green color. Greenschists also have pronounced schistosity . [ 3 ] Schistosity is a thin layering of the rock produced by metamorphism (a foliation ) that permits the rock to easily be split into flakes or slabs less than 5 to 10 ...
It is also used as a component of foundry sand and as a desiccant to remove moisture from air and gases. Montmorillonite clays have been extensively used in catalytic processes. Cracking catalysts have used montmorillonite clays for over 60 years. Other acid-based catalysts use acid-treated montmorillonite clays. [7]
The chlorite ion adopts a bent molecular geometry, due to the effects of the lone pairs on the chlorine atom, with an O–Cl–O bond angle of 111° and Cl–O bond lengths of 156 pm. [1] Chlorite is the strongest oxidiser of the chlorine oxyanions on the basis of standard half cell potentials.