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Sandstone A common type of building stone. Most sandstones are 'freestones', that is, they can be cut into blocks without any very obvious grain. Some sandstones are soft, and decay rapidly, others can be very hard. Cream-coloured sandstones were formed under water, and many of the red sandstones show evidence of having been formed of windblown material. When indenting new stone into an existing wall the replacement should resemble as closely as possible, both chemically and in appearance, the surrounding stone.