White pegmatite dikes with phenocrysts of microline, muscovite, and quartz intruding Early Tertiary-Late Cretaceous biotite granite near the summit of Mt. Lemmon. Dikes are commonly less than a meter in width, but some as much as several meters are observed.
Photographer: Mike Conway
Photo Date: July 2018
Latitude: 32.4446416667
Longitude: -110.759002778
Photo Location Accuracy: Known Location
Photo Tags: Mt. Lemmon, biotite granite, Natural resource, Santa Catalina Mountains, Early Tertiary, Late Cretaceous