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Section of the American Falls, Niagara. In front of the falls lie the larger blocks of Lockport dolomite, broken from the edge of the falls.

American Falls, Niagara

Section of the American Falls, Niagara. In front of the falls lie the larger blocks of Lockport dolomite,…

"Hexagonal-rhombohedral. Crystals are usually the unit rhombohedron (cleavage rhombohedron). Faces often curved, and sometimes so acurately as to form "saddle-shaped" crystals. Other forms rare." — Ford, 1912

Dolomite

"Hexagonal-rhombohedral. Crystals are usually the unit rhombohedron (cleavage rhombohedron). Faces often…