from The Century Dictionary.
- noun In petrography, a name proposed by Cathrein (1890) as a substitute for tonalite, and described as a granular igneous rock of the group intermediate between granite and diorite, containing orthoclase and plagioclase feldspars with hornblende and biotite. Brögger uses the term for highly quartzose monzonites.
Sorry, no etymologies found.
Approximately 15 million years ago a large mass of magma intruded between the folds of the Crocker Range and solidified into adamellite (a type of granite).