Andesite is an extrusive rock intermediate in composition between rhyolite and basalt. Andesite lava is of moderate viscosity and forms thick lava flows and domes. The word andesite is derived from the Andes Mountains in South America, where andesite is common. Andesite is the volcanic equivalent of diorite. Stonecontact.com, you can find all kinds of Andesite blocks and boulders in various sizes at the best prices and directly from the quarry owners
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Andesite is fairly strong, which allows it to be used in road and railway construction, and as fill gravel. The grayish colored rocks seen between railway ties are often andesite or its close relative, basalt. Andesite also can be used for garden decoration, paving, sculpture, masonry, wall stones.
What is the difference between basalt and andesite?View answer⌄
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Both lavas are formed at different plate boundaries which is why they have different silica contents: the basaltic lava forms from the hot mantle material at constructive plate boundaries and hotspots whereas the andesitic lava forms at destructive plate boundaries from melting crust.