Chemical Weathering Granite

Chemical weathering is the breakdown of rock induced by reactions between rock minerals and groundwater. A gravestone made of granite will therefore resist fracturing cracking and chipping longer than a sandstone marker found in the same location. Chemical weathering occurs when water dissolves minerals in a rock producing new compounds.

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5 2 chemical weathering chemical weathering results from chemical changes to minerals that become unstable when they are exposed to surface conditions.

Chemical weathering granite.

Some minerals like quartz are virtually unaffected by chemical weathering while. The remainder is 15 aluminum oxide and 10 various othe. Chemical weathering of granite occurs when dilute carbonic acid and other acids present in rain and soil waters alter feldspar in a process called hydrolysis. Hydrolysis is the chemical weathering of minerals by a mildly acidic water that forms when rains dissolves trace gases in the atmosphere.

The reaction of feldspar minerals in granite with rainwater produces kaolinite white clay known as china clay used in the production of porcelain paper and glass. Hydrolysis occurs for example when water comes in contact with granite. Breakdown of rock to depths of many metres induced by the chemical alteration of rock minerals by groundwater. Granite is extremely hard and less affected by the freeze thaw cycle the forces of abrasion and the surface exfoliation processes that are all a part of physical weathering.

As demonstrated in the following reaction this causes potassium feldspar to form kaolinite with potassium ions bicarbonate and silica in solution as byproducts. Granite contains on average 75 of silicon dioxide quartz and feldspar various metal aluminosilicates. This reaction is called hydrolysis. What are the products of physical and chemical weathering of granite.

The kinds of changes that take place are highly specific to the mineral and the environmental conditions.

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