A Sedimentary Rock
The Breccia
The sedimentary rock are formed by chemical and mechanical activities of denudation on pre-existing rocks and which deposited at a particular site. After followed many processes deposition, compaction, cementation and recrystallization of pre-existing rocks converts into a sedimentary rock. For example: Shale, Sandstone, Limestone, Conglomerate, dolomite etc.
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| Sedimentary rock |
Breccia Rock
The base points of breccia rock are following:
1) This is a type of clastic sedimentary rock under rudaceous category.
In rudaceous category the rock have big clast size, such as gravels, pebbles and boulders.
2) Grain size are greater than 2.0 mm.
3) Grains shape is angular.
The Conglomerate rock have rounded grain shape.
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| Conglomerate rock |
Breccia forms when accumulation of broken fragments of pre-existing rocks having greater than 2 mm in dia. and angular in shape. Pebbles(2-64mm), Cobbles(64-256mm), Boulders(>256mm) are bound in fine grained matrix like sand or silt etc and cemented by silica, calcium carbonate or iron oxide.
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| Clast of pre-existing rock |
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| Rock fragments |
Breccia may be individual composed of quartz, feldspar, calcite or may be rocks fragments.
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