breccia - hydrothermally altered breccia in jasper - hand specimen

A breccia, from the Italian for broken, is a rock composed of angular broken fragments that have later been cemented. When the fracturing is a result of faulting, there may be displacement of the rock fragments or clasts. Clast refers to the fragments, from the Greek, klastos, for broken in pieces.

This breccia was hydrothermally altered by solutions bearing silica. The hydrothermal fluids filled the fractures, rounded the clast edges and cemented the fine sediment particles, forming a yellow jasper. It was collected near Ojinaga, Chihuahua, Mexico.

Cut on one side but not polished, natural on the other. Both sides are shown.

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