Today's Mineral: Dolomite! This specimen is from the Vekol Mountains southwest of Casa Grande, AZ, in the northern part of the Tohono O'odham Indian Reservation. Some call this variety "ferroan dolomite" due to the brown color, caused by the presence of iron.
Type Locality: Vekol Mine, Vekol District, Pinal Co., AZ...
Donor: Lenn Pritchard, Seven Cities Mining
Today's Mineral is a social media product of the Arizona Geological Survey's MMNRE Curator.