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Cryptocrystalline
 
 
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Cryptocrystalline is a rock
Rock (geology)

In geology, rock is a naturally occurring solid aggregate of minerals and/or mineraloids.The Earth's outer solid layer, the lithosphere, is made of rock....
 texture
Texture (crystalline)

In materials science, texture is the distribution of crystallographic orientations of a sample. A sample in which these orientations are fully random is said to have no texture....
 which is so finely crystalline, being made up of such minute crystal
Crystal

A crystal or crystalline solid is a solid material whose constituent atoms, molecules, or ions are arranged in an orderly repeating pattern extending in all three spatial dimensions....
s, that its crystalline nature is only vaguely revealed even microscopically in thin section
Thin section

In optical mineralogy and petrography, a thin section is a laboratory preparation of a Rock , mineral or soil sample for use with a polarization petrographic microscope....
 by transmitted polarized light. Among the sedimentary rock
Sedimentary rock

Sedimentary rock is one of the three main Rock types . Sedimentary rock is formed by deposition and consolidation of mineral and organic material and from precipitation of minerals from solution....
s, chert
Chert

Chert is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color , but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green ar...
 and flint
Flint

Flint is a hard, sedimentary rock cryptocrystalline form of the mineral quartz, categorized as a variety of chert. It occurs chiefly as Nodule s and masses in sedimentary rocks, such as chalks and limestones....
 are cryptocrystalline. Carbonado, a form of diamond, is also cryptocrystalline. Volcanic rocks, especially of the acid
Acid

An acid is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion Activity greater than in pure water, i.e....
ic type such as felsite
Felsite

Felsite is a very fine grained volcanic rock that may or may not contain larger crystals. Felsite is a field term for a light colored rock that typically requires petrographic examination or chemical analysis for more precise definition....
s and rhyolite
Rhyolite

This page is about a volcanic rock. For the ghost town see Rhyolite, Nevada, and for the satellite system, see Rhyolite/Aquacade.Rhyolite is an igneous rock, volcanic rock , of felsic composition ....
s, may have a cryptocrystalline groundmass
Matrix (geology)

The matrix or groundmass of rock is the fine-grained mass of material in which larger grains or crystals are embedded.The matrix of an igneous rock consists of fine-grained, often microscopic, crystals in which larger crystals are embedded....
 as distinguished from pure obsidian
Obsidian

Obsidian is a naturally occurring glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth....
 (acidic) or tachylyte
Tachylyte

Tachylite is a vitreous form of basaltic volcanic glass. This "glass" is formed naturally by the rapid cooling of molten basalt. It is a basic type of igneous rock that is decomposable by acids and readily fusible....
 (basic), which are natural rock glass
Glass

Glass generally refers to a Hardness, brittle, transparency amorphous solid, such as that used for windows, many Glass Bottles, or eyewear, including, but not limited to, soda-lime glass, borosilicate glass, acrylic glass, sugar glass, Muscovite , or aluminium oxynitride....
es.








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Encyclopedia


Cryptocrystalline is a rock
Rock (geology)

In geology, rock is a naturally occurring solid aggregate of minerals and/or mineraloids.The Earth's outer solid layer, the lithosphere, is made of rock....
 texture
Texture (crystalline)

In materials science, texture is the distribution of crystallographic orientations of a sample. A sample in which these orientations are fully random is said to have no texture....
 which is so finely crystalline, being made up of such minute crystal
Crystal

A crystal or crystalline solid is a solid material whose constituent atoms, molecules, or ions are arranged in an orderly repeating pattern extending in all three spatial dimensions....
s, that its crystalline nature is only vaguely revealed even microscopically in thin section
Thin section

In optical mineralogy and petrography, a thin section is a laboratory preparation of a Rock , mineral or soil sample for use with a polarization petrographic microscope....
 by transmitted polarized light. Among the sedimentary rock
Sedimentary rock

Sedimentary rock is one of the three main Rock types . Sedimentary rock is formed by deposition and consolidation of mineral and organic material and from precipitation of minerals from solution....
s, chert
Chert

Chert is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color , but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green ar...
 and flint
Flint

Flint is a hard, sedimentary rock cryptocrystalline form of the mineral quartz, categorized as a variety of chert. It occurs chiefly as Nodule s and masses in sedimentary rocks, such as chalks and limestones....
 are cryptocrystalline. Carbonado, a form of diamond, is also cryptocrystalline. Volcanic rocks, especially of the acid
Acid

An acid is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion Activity greater than in pure water, i.e....
ic type such as felsite
Felsite

Felsite is a very fine grained volcanic rock that may or may not contain larger crystals. Felsite is a field term for a light colored rock that typically requires petrographic examination or chemical analysis for more precise definition....
s and rhyolite
Rhyolite

This page is about a volcanic rock. For the ghost town see Rhyolite, Nevada, and for the satellite system, see Rhyolite/Aquacade.Rhyolite is an igneous rock, volcanic rock , of felsic composition ....
s, may have a cryptocrystalline groundmass
Matrix (geology)

The matrix or groundmass of rock is the fine-grained mass of material in which larger grains or crystals are embedded.The matrix of an igneous rock consists of fine-grained, often microscopic, crystals in which larger crystals are embedded....
 as distinguished from pure obsidian
Obsidian

Obsidian is a naturally occurring glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth....
 (acidic) or tachylyte
Tachylyte

Tachylite is a vitreous form of basaltic volcanic glass. This "glass" is formed naturally by the rapid cooling of molten basalt. It is a basic type of igneous rock that is decomposable by acids and readily fusible....
 (basic), which are natural rock glass
Glass

Glass generally refers to a Hardness, brittle, transparency amorphous solid, such as that used for windows, many Glass Bottles, or eyewear, including, but not limited to, soda-lime glass, borosilicate glass, acrylic glass, sugar glass, Muscovite , or aluminium oxynitride....
es.

See also

  • List of rock textures
    List of rock textures

    This page is intended to be a list of rock texture and morphology terms....
  • Rock microstructure
    Rock microstructure

    Rock microstructure includes the Texture of a rock and the small scale rock structures. The words "texture" and "microstructure" are interchangeable, with the latter preferred in modern geological literature....
  • Chalcedony
    Chalcedony

    Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of the minerals quartz and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, whilst moganite is monoclinic....
  • Agate
    Agate

    Agate is a microcrystalline variety of quartz , chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks but can be common in certain metamorphic rocks....
  • Microcrystalline
    Microcrystalline

    A microcrystalline material is a crystallized substance or rock which contains small crystals that are visible only through microscope examination....
  • Nanocrystalline
  • Macrocrystalline
    Macrocrystalline

    In geology, macrocrystalline Rock have crystals large enough to easily be identified by sight. Macrocrystalline or phaneritic texture is common in intrusive igneous rocks which cooled slowly enough for crystal growth....