What Is the Hardness of Limestone?

Chalk

• Formed from the condensed layers of ancient coccoliths and foraminifera remains, the soft white mineral rates a 1 on Mohs Hardness Scale. Many of the world's largest chalk deposits began forming up to 65.5 million years ago during the Cretaceous Period. Now most notably evident in the White Cliffs of Dover, modern industry uses the soft limestone as a fertilizer and filler in many commercial products.

Carboniferous Limestone

• Carboniferous limestone takes form as either a fine-grained calcite mud in ancient shallow seas or as shelly limestone. Shelly limestone forms from layers of crushed coral. Both find use in industry as strong stones for use in roads, cement, and architecture. Caches of limestone from different locations can possess different hardness scores. F.G. Bell reported in the "Bulletin of Engineering, Geology, and the Environment" that carboniferous limestone consistently rated as harder and stronger than magnesian limestone, inferior oolitic limestone and great oolitic limestone.

Tufa

• Tufa forms chemically as natural spring waters deposit calcium carbonate on the surrounding rock surfaces. Ancient architects used the spongey, light mineral on the outside facing of buildings in Rome, and in the vaulted ceilings of European cathedrals. Depending on the exact mineral, tufa ranks as a 3.5 to 4 on Mohs' scale. When tufa compacts, it forms travertine.

Travertine

• Travertine, also called Mexican onyx, forms near natural springs. As calcium carbonate collects and crystalizes over the years, small plants and animals grow and die on its surface, creating small empty pockets in the rock. Travertine rates closer to a 4 or 5 on Mohs' scale, depending on the exact mineral specimen. Homeowners often use travertine to tile floors or garden paths, despite the fact that the softness of the stone often leads to a worn-down path along common routes.