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Stockpiles are necessary to turn stone into bricks.
Stockpiles must be built on flat surfaces and occupy 2x2 voxels.
Once a stockpile reaches 80 stones, they will turn into 4 bricks.
It is possible to stop stones from automatically converting by opening the radial menu on a stockpile and releasing on the "Convert To" at the top of the radial menu. It is also possible to select several stockpiles and toggling the conversion to apply the change to them all at once.
Opening the radial menu on one or several stockpiles will allow you to specify which type of resource is allowed on it.