Datolite, Calcite
Knippa Quarry, Knippa, Uvalde County, Texas, USA
Datolite "crystal ball" is 1.8mm in diameter perched happily on a calcite rhomb. From the west vent of the maar crater in Knippa, Uvalde Co., Texas. Collectee by Don Saathoff, 1993. Photo by and in the collection of Don Saathoff.