Garnet Ridge, Dinnehotso, Monument Valley, Navajo Indian Reservation, Apache Co., Arizona, USA

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‡Ref.: Gregory, H.E. (1916), Garnet deposits on the Navajo Reservation, Arizona and Utah, Economic Geology: 11: 223-230.

Williams, H. (1936), Pleiocene volcanics of the Navajo-Hopi country, Geological Society of America Bull.: 47: 111-172.

Page, L.R. (1956), Contributions to the geology of uranium and thorium by the USGS and USAEL for the United Nations International Conference on peaceful uses of atomic energy, Geneva, Switzerand, USGS PP 300: 182-184, 539.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 34, 77, 94, 95.

Witkind, I.J. & R.E. Thaden (1963), Geology and uranium-vanadium deposits in the Monument Valley area, Apache & Navajo Counties, Arizona, USGS Bull. 1103: 54-60, 61.

Gavasci, A.T. & P.F. Kerr (1968), Uranium emplacement at Garnet Ridge, Economic Geology: 63: 859-876.

Watson, K.D. & D.M. Morton (1969), Eclogite inclusions in kimberlite pipes at Garnet Ridge, northeastern AZ, Am.Min.: 54: 267-285.

Peirce, H.W. (1969), Gem materials, in USGS, Arizona Bureau of Mines, and U.S.Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180, USG Bull. 871: 359.

Phillips, K.A. (1987), Arizona industrial minerals, AZ Dept. Mines & Min. Resources Report 4.

Mineralogical Record: 32: 211.

Keirsch, G.A., Mineral resources Navajo-Hopi Indian Reservations, Arizona-Utah, University of Arizona Press: 90-94.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 102, 116, 122, 150, 165, 171, 172, 204, 214, 256, 257, 260, 273, 283, 285, 317, 318, 358, 367, 388, 405, 406.

Wang,L., R.C. Rouse, E.J. Essene, D.R. Peacor, and Y. Zhang (2000) Carmichaelite, a new hydroxyl-bearing titanite from Garnet Ridge, Arizona. American Mineralogist: 85: 792-800.

Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 3.

Garnet Ridge is located in the Navajo volcanic field near Dinnehotso. It is named for the pyrope garnets that occur in the serpentine deposits that intrude host rocks of Jurassic age about 35 miles NE of Kayenta, AZ.

The serpentine deposits are mainly in pipes choked with rock debris derived from a section more than 5,000 feet thick, ranging in age from Precambrian (?) to Cretaceous.

The intrusive serpentine deposits occur as pipe fillings and, rarely, as dikes & sills. The pipes are aligned NE-ward, parallel to the regional strike, but the dikes are parallel to joints that trend NW-ward. Pipe No. 1, at the crest of the ridge, measures 1,000 feet across; pipes 2, 3 & 4, about 2 miles NE, form a cluster 1,500 to 4,000 feet diameter, which trends NW-ward. The pipes are steep-walled & irregularly shaped.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Actinolite Aegirine Ankerite Antigorite Augite Biotite Calcite Carmichaelite (TL) Chalcopyrite 'Chlorite Group' Chromite

Chrysocolla Chrysotile Diopside var: Chromian Diopside Epidote Gypsum 'Hornblende' Hypersthene Ilmenite Lawsonite Limonite

Magnesiochromite Malachite 'Melilite' Microcline Muscovite 'Olivine' Omphacite Pyrite Pyrope Quartz Rutile

'Serpentine Group' Spinel Srilankite Talc Tangeite Tyuyamunite Uraninite Zircon

42 entries listed. 32 valid minerals. 1 type locality (valid mineral).

Localities in this Region

USA Arizona Apache Co. Navajo Indian Reservation Monument Valley Dinnehotso Garnet Ridge Keith Francis claim