What is Andesite? Andesite is a fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as hornblende, pyroxene and biotite.We also called it grey basalt in China. Flagstone is one of the most beautiful paving types available for walkways and patios. It also has many practical advantages over other paving types. Flagstone is a dense stone that resists damage from the freeze-thaw cycle and holds up well under heavy use. It is also naturally slip-resistant. Building your own flagstone walk will not only enhance your property but also provide you with years of enjoyment.
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