Fresh surfaces contain grey-white, anhedral calcite and dolomite crystals. Weathered surfaces are dark brown, with a fine powder observable after handling in hand sample. Bubbles from acid reaction turn dark brown on weathered surfaces. These weathered bubbles leave behind a brown residue. Bubbles on fresh faces remain white and leave no residue. (FOV: 1.28)
Purchased from Western Minerals, Inc.
Number of Thin Sections