This is a volcanic breccia from the farm Murrelfontein adjacent to the contact with the gabbro unit. It includes partially melted glass and tridymite, a high temperature polymorph of quartz, and has a brecciated appearance. The breccia has a …
Hand Sample: Imperfect volcanic bomb. Aphanitic with reddish brown color. Observed mudcrack texture of surface likely formed due to weathering. Sample contains abundant vesicles (< 0.05cm in size).