Aleurite ( English aleurite, silt ; German Aleurit ; from other Greek. Ἄλευρον “flour”) is a loose finely clastic sedimentary rock .
Description
Aleurite consists mainly of mineral grains ( quartz , feldspars , mica, and others) of 0.01-0.1 mm in size, occupying an intermediate position between clay and sand ( loess , silt , dust ).
According to the prevailing grains, large-aleurite (0.05-0.1 mm) and fine-aleurite or fine aleurite (0.01-0.05 mm) varieties of aleurite are distinguished.
Aleurite was separated into a separate sedimentary rock at the proposal of the Soviet petrograph A.N. Zavaritsky in 1930.
Aleurite is used in the manufacture of cement.
As a result of lithification, silt turns into siltstone .
Literature
- "Geological Dictionary", M: "bowels", 1978.
Links
- Aleurite // Great Soviet Encyclopedia : [in 30 vol.] / Ch. ed. A.M. Prokhorov . - 3rd ed. - M .: Soviet Encyclopedia, 1969-1978.
- Aleurite - article from the Great Encyclopedia of Cyril and Methodius
Clastic rocks
| Breed group | Debris size | incoherent | Cemented | ||
|---|---|---|---|---|---|
| Rounded | Neokatannye | Rounded | the sharp-edged | ||
| Coarse rocks ( psephitis ) | 10 - 1 m | Block boulders | lumps | - | - |
| 1 m - 10 cm | boulders | Breaks (blocks) | Boulder conglomerate | Otlomovaya (bloc) breccias | |
| 10 - 1 cm | pebble | crushed stone | Pebble conglomerates | Crushed Breccias | |
| 1 cm - 2 mm | Gravel | Dresva | Gravelites | Gingerbread man | |
| Sand rocks ( psammity ) | 2 - 0.05 mm | Sands | Sandstones | ||
| Silty rocks ( siltstones ) | 0.05 - 0.005 mm | Siltstone | Siltstone | ||
| Argillaceous rocks ( pelites ) | <0.005 mm | Silt , clay | Clays , mudstones | ||