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204	204	Gravel is a loose aggregation of rock fragments. Gravel is classified by particle size range and includes size classes from granule- to boulder-sized fragments. ISO 14688 grades gravels as fine, medium, and coarse with ranges 2 mm to 6.3 mm to 20 mm to 63 mm.
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206		-== [[Gypsum>>doc:Rock types.Salts.Gypsum.WebHome]] ==
	206	+== [[Gypsum>>doc:Gesteentes.Salts.Gypsum.WebHome]] ==
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208	208	Gypsum is the common name for CaSO,,4,,·2 H,,2,,O and is present at places where the sea water is partly or totally dried up. These dried up areas form loose layers in between the other rocks. This type of rock is soluble in water and is formed close to halite and anhydrite. Gypsum breaks into rhombus shaped pieces.
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