Dolomite, crystalline carbonate of lime and carbonate of magnesium named for the geologist Dolomieu, are rare in the Rockies. Dolomite is formed when water containing dissolved magnesium seeps into sediments that are largely calcium carbonate. The magnesium then replaces some of the calcium. The resultant rock is stronger and more colourful than limestone. The cliffs of Dolomite Peak are a mixture of limestone and dolomite. The rock has weathered into splintered and jagged crests with slender rock towers. [M.B. Williams]