gravel

タイトルまたは説明

Gravel: refers to the weathering of rock by the water long-term handling of diameter 2 ~ *0mm of natural aggregate free edges.
Pebble: refers to is weathering of rock by the water for a long time handling and particle size of *0 ~ **0mm no edges and corners of the natural ovoid grain; more than **0 mm who says boulders.
The main chemical composition of gravel is silica, followed by a small amount of iron oxide and trace amounts of manganese, copper, aluminum, magnesium and other elements and compounds. They themselves with different colors, such as red as the iron, the blue copper, purple for manganese, translucent yellow for silica gel chalcedony, jade color with green mineral and so on; due to the different kinds and contents of these pigment ions dissolved silica hydrothermal, thus showing a depth of shade, the changing color pebbles show black, white, yellow, red, green, green color.

Gravel classification
Gravel is a name for the classification of sediments. Often expressed as a symbol G. Rock or mineral debris, with an average particle size of more than 1 mm.
According to the average particle size, and the gravel subdivision into three kinds of boulders, cobbles and fine gravel: average particle size of 1 - *0 mm of that fine gravel; *0 - **0 mm of that coarse gravel; greater than **0 mm, said the boulder. After being consolidated into rock, the gravel is called conglomerate or.
Physical and chemical index

Analysis project
Measure data
Analysis project
Measure data
Silicon dioxide (Sio2)
More than *8%
Fe2o3
0.*4%
Hydrochloric acid soluble rate
Less than or equal to 0.2%
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