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Argillaceous minerals

 

 
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Argillaceous minerals
 
 
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Argillaceous minerals appear silvery upon optical reflection and are mineral
Mineral

A mineral is a naturally occurring solid formed through Geology processes that has a characteristic chemical composition, a highly ordered atomic structure, and specific physical properties....
s containing substantial amounts of clay
Clay

Clay is a naturally occurring material composed primarily of fine-grained minerals, which show plasticity through a variable range of water content, and which can be hardened when dried and/or fired....
-like components ( = clay). Argillaceous components are fine-grained (less than 2 µm
Micrometre

A micrometre or micron is one Micro- of a metre, or equivalently one thousandth of a millimetre. It is also commonly known as a micron....
) aluminosilicate
Aluminosilicate

Aluminosilicate minerals are minerals composed of aluminium, silicon, and oxygen. They are a major component of kaolin and other clay minerals....
s, and more particularly clay minerals such as kaolinite, montmorillonite
Montmorillonite

Montmorillonite is a very soft Silicate minerals mineral that typically forms in microscopic crystals, forming a Clay mineral. It is named after Montmorillon in France....
-smectite, illite
Illite

Illite is a non-expanding, clay-sized, micaceous mineral. Illite is a Silicate minerals or layered alumino-silicate. Its structure is constituted by the repetition of Tetrahedron ? Octahedron ? Tetrahedron layer....
, and chlorite
Chlorite group

The chlorites are a group of Silicate minerals minerals. Chlorites can be described by the following four Solid solution based on their chemistry via substitution of the following four elements in the silicate lattice; Mg, Fe, Ni, and Mn....
. Clays and shale
Shale

Shale is a fine-grained sedimentary rock whose original constituents were clay minerals or muds. It is characterized by thin laminae breaking with an irregular curving fracture, often splintery and usually parallel to the often-indistinguishable bedding plane....
s are thus predominantly argillaceous.

The adjective "argillaceous" is also used to define rocks in which clay minerals are a minor but significant component.






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Argillaceous minerals appear silvery upon optical reflection and are mineral
Mineral

A mineral is a naturally occurring solid formed through Geology processes that has a characteristic chemical composition, a highly ordered atomic structure, and specific physical properties....
s containing substantial amounts of clay
Clay

Clay is a naturally occurring material composed primarily of fine-grained minerals, which show plasticity through a variable range of water content, and which can be hardened when dried and/or fired....
-like components ( = clay). Argillaceous components are fine-grained (less than 2 µm
Micrometre

A micrometre or micron is one Micro- of a metre, or equivalently one thousandth of a millimetre. It is also commonly known as a micron....
) aluminosilicate
Aluminosilicate

Aluminosilicate minerals are minerals composed of aluminium, silicon, and oxygen. They are a major component of kaolin and other clay minerals....
s, and more particularly clay minerals such as kaolinite, montmorillonite
Montmorillonite

Montmorillonite is a very soft Silicate minerals mineral that typically forms in microscopic crystals, forming a Clay mineral. It is named after Montmorillon in France....
-smectite, illite
Illite

Illite is a non-expanding, clay-sized, micaceous mineral. Illite is a Silicate minerals or layered alumino-silicate. Its structure is constituted by the repetition of Tetrahedron ? Octahedron ? Tetrahedron layer....
, and chlorite
Chlorite group

The chlorites are a group of Silicate minerals minerals. Chlorites can be described by the following four Solid solution based on their chemistry via substitution of the following four elements in the silicate lattice; Mg, Fe, Ni, and Mn....
. Clays and shale
Shale

Shale is a fine-grained sedimentary rock whose original constituents were clay minerals or muds. It is characterized by thin laminae breaking with an irregular curving fracture, often splintery and usually parallel to the often-indistinguishable bedding plane....
s are thus predominantly argillaceous.

The adjective "argillaceous" is also used to define rocks in which clay minerals are a minor but significant component. For example, argillaceous limestones are limestone
Limestone

File:Limestone Formation In Waitomo.jpgLimestone is a sedimentary rock composed largely of the mineral calcite . The deposition of limestone strata is often a by-product and indicator of biological activity in the geology record....
s consisting predominantly of calcium carbonate
Calcium carbonate

Calcium carbonate is a chemical compound with the chemical formula CalciumCarbonOxygen3. It is a common substance found as Rock in all parts of the world, and is the main component of seashells, snails, and eggshells....
, but including 10-40% of clay minerals: such limestones, when soft, are often called marl
Marl

Marl or Marlstone is a calcium carbonate or lime-rich mud or mudstone which contains variable amounts of clays and aragonite. Marl is originally an old term loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate, formed under...
s. Similarly, argillaceous sandstones are sandstone
Sandstone

Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock Particle size . Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust ....
s consisting primarily of quartz
Quartz

Quartz is the most abundant mineral in the Earth's continental crust . It is made up of a Crystal structure of silica tetrahedra. Quartz has a hardness of 7 on the Mohs scale and a density of 2.65 g/cm?....
 grains, with the interstitial spaces filled with clay minerals.