Garnetite near Crown King, Arizona


34° 10' 56.8" N 112° 21' 14.7" W 6206' (WGS84) (Google Maps)

Land Status:

Prescott National Forest


A garnet tactite (garnetite) horizon featuring well-formed garnet crystals is located in the complex Proterozoic metamorphic rocks south of Crown King. The coordinates give the location of a roadcut along Forest Road 192 in which the rock is exposed. The locality is slightly south of the contact between the Crown King Granodiorite and the metamorphic package, so the tactite may be a product of contact metamorphism. (The rock is mapped as a 'calcareous mafic tuff,' whatever that means....) Forest Road 192 is well-graded, although narrow, all the way to the Oro Belle ghost town.

UPDATE (September 2015): The combination of time, weather, and excessive use by off-road-vehicle enthusiasts has unfortunately seriously degraded Forest Road 192. The drive to this outcrop now appears to require high clearance and a lot of patience.


Geologic Map of the Mayer-Crown King Area, Yavapai County, Arizona, and Metamorphic and Chemical Data Map, Mayer-Crown King Area, Yavapai County, Arizona (Arizona Geological Survey)

The Outcrop

The Outcrop Along the Road

Garnet Crystals

Layering in the Tactite

Oro Belle Ghost Town

Site visited on 6/11/2011Page created on 11/15/2014