Some of the building stones are: limestone, marble, sandstone, flagstone, flint, slate, granite, basalt (green-stone), serpentine, and porphyry. Ornamental stones, other than gems, include alabaster, fluorspar, jade, jasper, labradorite, lapis lazuli, and malachite. Mexican onyx marble (stalagmitic aragonite) and Algerian onyx marble, less handsomely colored, are relatively recent ad­ditions to the ornamental stones, as is the jasperized wood of Arizona.
   The principal sources of American marble are in the States bordering the Appalachian Mountains, and particularly Vermont, Massachusetts, western Connecticut, eastern New York, Georgia, and eastern Tennessee.