Definitions and images to illustrate geological terms, links to images and website articles


basalt breccia with epidote groundmassBreccia is a are clastic, sedimentary rocks comprising angular fragments from a previous rock structure that have been cemented in a matrix.

Classification of breccias relates to their constituents, mode of occurrence, constituent fragment size, types of clasts, and source of clasts.
image: basalt breccia with epidote groundmass, courtesy of Siim Sepp

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