Glory mine, mined and shipped; Duquesne-Washington camp, Pride of
the West, Bonanza, Holland, Belmont, and New York mines. Yavapai
County, common in Bradshaw Mountains district; carries free gold at
Crown King and other mines, and gold and silver at United Verde mine,
Jerome district; has been produced by the Copper King mines in the
Tiger district.

Stephanite. Santa Cruz County, Golden Rose mine.

Stibnite (sulphide of antimony). Mohave County, in Cerbat district, at Vanderbilt mine. Yavapai County, common in silver veins; in ores of Bradshaw Mountains carries free gold. Turkey Creek district, commercial deposit with 2-foot pay streak.

Stromeyerite. Pinal County, Silver King mine, with other cupriferous and argentiferous ores.

Strontium. See Celestite.

Tantalum. See Wolframite.

Tennantite. Santa Cruz County, Tyndall district, Toluachi mine.

Tenorite. Cochise County, unimportant copper ore; occurs in Lowell and Copper Queen mines, Bisbee, and elsewhere. Pima County, Helvetia district, Bulldozer mine. Santa Cruz County, Tyndall district, Alto mine; Harshaw district, Sunnyside and Blue Eagle mines.

Tetradymite (telluride of bismuth). Yavapai County, small quantity in Montgomery mine, at Minnehaha, and near Bradshaw City.

Tetrahedrite (gray copper). Pima County, Helvetia district, Silver Spur (old Frijole) mine; Greaterville district, Summit mine. Santa Cruz County, Tyndall district, Treasure Vault, Shehey-O'Donnell, Rhode Island, Alto, Wandering Jew, Toluachi group, and Eureka mines; Wrightson district, Blackcap, American Boy, Augusta, and Happy Jack mines; Harshaw district, World's Fair mine; Patagonia district, Endless Chain mine; San Cayetano district, Tubutana mine. Pinal County, Heintzelman and Silver King mines. Yavapai County, in ores of Bradshaw Mountains district; also in copper-silver veins.

Thenardite (verde salt). Yavapai County, Verde Valley, 3 miles southwest of Old Camp Verde, occurs in large beds with rock salt, glauberite, and mirabilite.

Tourmaline. Pinal County, in the Catalina Mountains near Oracle in granite. Gem material has not been found.

Travertine. Mohave County, abundant at the mouth of the Grand Canyon;

Tuff.

also a few miles west of that locality there are extensive deposits, thought to be travertine, which cap Greggs Breccia and are in places 200 feet in thickness.

Mohave County, at Kingman, fine grade. Pima County, near Tucson, used extensively for building. Santa Cruz County, at Nogales, used extensively for building, in lower east slope of San Cayetano Mountains, 5 miles north of Calabasas; in Grosvenor Hills 7 miles west of Patagonia may be quarried in thin slabs, suitable for building and paving, also at Harshaw used for building. Yavapai County, near Skull Valley and near Wickenburg; was used in building the State capitol at Phoenix. Tungsten minerals. See Cuproscheelite, Cuprotungstite, Ferberite, Hübnerite, Scheelite, and Wolframite.

Turquoise.

Cochise County, has been mined near Courtland, at Turquoise Mountain. Maricopa County, occurs 12 miles east of Morristown, reported. Mohave County, several mines worked near Mineral Park yield large quantities of gem material. Pinal County, 2 miles south of Kelvin, east side of Verde River, about 2 miles from Maricopa County line. Yavapai County, reported.

Uraninite. Santa Cruz County, Wrightson district, Happy Jack mine (re

ported). Vanadinite. Occurs at numerous places associated with lead ore. Cochise County, near Fairbanks; Gila County, Globe district, at Lockwood claim, Clark & Stewart claims near Old Dominion mine; Mohave County, in the Eldorado and neighboring mines of the Gold Basin district; Pima County, Old Yuma mine, 14 miles northwest of Tucson; Pinal County, Mammoth mine at Shultz, Royal Dane claim, 7 miles southwest of Oracle, Black Prince mine, Pioneer district, and at Kelvin; Santa Cruz County, Mowry mine at Mowry; Yavapai County, near Silver Belt mine, Big Bug district; Yuma County, Red Cloud mine.

Vanadium ores.

See Descloizite, Vanadinite, and Volborthite.

Verde salt. See Thenardite.

Volborthite (vanadate of copper). Occasionally found in other copper and lead ores.

Volcanic ash. See Tuff.

Wad (manganese ore). Cochise County, occurs at Tombstone; mined for silver content only.

Willemite (silicate of zinc). Greenlee County, small grayish crystals in Modoc open cut on Modoc Mountain, Clifton-Morenci district. Wolframite (tungstate of iron and manganese). Cochise County, Dragoon Mountains, contain extensively worked deposits near Dragoon Summits; Whetstone Mountains, 12 miles south of Benson; Paradise. Gila County, Globe. Maricopa County, at Cave Creek, 30 miles north of Phoenix. Mohave County, 40 miles southeast of Kingman and 35 miles east of Yucca in Aquarius Cliffs. Pima County, with gold and quartz in Arivaca district. Pinal County, Powers Gulch, 18 miles west of Globe; mined. Santa Cruz County, 7 miles north of Nogales, at Reagan camp. Yavapai County, Tiptop district, Bradshaw Mountains, mined at Arex, in Eureka district, 45 miles west of Prescott, and at Canyon, Goodwin, and Hillside; in Humbug district, 38 miles north of Peoria, the material contains 1 per cent tantalum; occurs also at Hot Springs, 28 miles north of Peoria. Wood, petrified. In eastern part of State, in Apache and Navajo counties, 6 miles south of Adamana and 12 miles southeast of Holbrook, on the Atchison, Topeka & Santa Fe Railway, is the Petrified Forest National Monument, including Chalcedony Park, where many square miles are in part covered and underlain with petrified logs, tree trunks, branches, and bright-colored fragments. Another notable area, the North Forest, lies 8 miles northwest of Adamana, in Navajo County. The finest specimens are found in the Holbrook-Adamana region, occurring in the Triassic "Red Beds." In Mohave and Yuma counties petrified wood is reported to be abundant in the Grand Canyon and the country extending southward along Colorado River to Yuma, but here it probably occurs chiefly as a constituent of alluvium transported by the river.

Wulfenite (molybdate of lead). Occasionally found with other lead ores. Cochise County, nearly always present with silver ores of Tombstone in small quantity. Coconino County, in canyon of Oak Creek, 25 miles south of Flagstaff. Occurs also in Gila County, at Troy. Maricopa County, in Phoenix mine above Cave Creek, and in Big Horn Mountains. Pima County, Old Yuma mine, 14 miles northwest of Tucson; Empire district, Total Wreck and Verde Queen mines. Pinal County, mined at Mammoth mine, Shultz; also on the Orizaba and other claims, 30 miles south of Casa Grande, associated with minor amounts of vanadinite. Santa Cruz County, 4 miles northeast of Patagonia. Yavapai County, Bradshaw Mountains, near Briggs and near Columbia. Yuma County, at Castle Dome.

Zinc. Principal production of zinc in State is in Mohave County at Golconda and Tennessee mines; small quantities in Santa Cruz County in Patagonia and Tyndall districts. See also Smithsonite, Sphalerite, and Willemite.

27608°-Bull. 624-17—8

ARKANSAS.

Agate. Montgomery County, finely variegated; has been mined.
Aluminum. See Bauxite.

Antimony ore. See Stibnite.

Asphalt. Madison County. Pike County, in the Trinity sand, 2 miles southeast of Pike; has been used to a small extent. Polk County, as veins or fissure filling near west end of Fourche Mountain, north of Mena. Sevier County, east of De Queen (in the Trinity sand).

Azurite (blue carbonate of copper). Montgomery County, near Silver. Polk County, at Copper Queen and Silver World mines. Searcy County, copper mines at Tomahawk; not worked as ore. Sevier County, at antimony and silver mines.

Barite (heavy spar). Garland, Montgomery, Pike, Polk, Pulaski, Saline, and Sevier counties, in seams or pockets.

Bauxite. Pulaski and Saline counties, the principal producing area of the United States from 1904 to 1914, inclusive. The major part of the production comes from what is known as the Bauxite district, sometimes called the Bryant district, lying about 18 miles southwest of the city of Little Rock and covering an area of about 12 square miles in Bryant Township near Benton, in Saline County. The second and less important district is known as the Fourche Mountain district, lying immediately south of the city limits of Little Rock in Pulaski County and embracing an area somewhat larger than the Bauxite district. The two areas are about 14 miles apart.

Braunite (manganese ore).

Independence, Izard, and Sharp counties, mined

with psilomelane in Batesville district.

Brookite. Hot Springs County, abundant as good museum specimens in several places at Magnet Cove, with quartz.

Brown iron ore. See Limonite.

Cadmium. See Greenockite.

Calamine (zinc silicate). Boone County, in Almy mine. Lawrence County, in Bath and Koch mines. Marion County, in zinc mines of Sugar Orchard region and elsewhere; has been mined.

Celestite (strontium sulphate). Howard, Pike, and Sevier counties, as thin layer in Lower Cretaceous limestone (Trinity formation). In Pike County, at White.

Cement material (Portland). Limestone suitable for Portland cement occurs in many counties in northwestern part of the State. Little River County, large cement plant at White Cliffs, idle since 1903.

Cerusite (lead carbonate). Howard, Montgomery, Newton, and other counties, with galena and coating it in mines in northern Arkansas.

Chalcopyrite. Sevier County, in Davis mine 5 miles west of Gillham, and in other mines and prospects in western Arkansas.

Chalk. The Annona chalk of the Upper Cretaceous outcrops over a strip about half a mile wide, extending northeast and southwest from White Cliffs, Sevier County, through Howard, Hempstead, Nevada, and Clark counties, almost to Okolona. Formerly used in manufacture of Portland cement at White Cliffs.

Chert. Large deposits (Bigfork chert) in Saline, Pulaski, Garland, Montgomery, and Polk counties; mined for road building at Hot Springs, Garland County. Cherts belonging to the Mississippian series of the Carboniferous system and to the Ordovician system of rocks are widely distribnted in all the counties north of the Boston Mountains.

Clay (ball or paper). Pike County.

Clay (brick). Arkansas County, common brick, made from red surface clay at Stuttgart. Ashley County, alluvial buckshot clay used for common brick at Hamburg. Benton County, pits in residual red clay used for common brick, at Bentonville, Rogers, and Siloam Springs. Boone County, at Harrison. Bradley County, at Warren. Carroll County, common brick made from residual clays at Berryville and Green Forest. Clark County, common brick made from alluvial clay at Arkadelphia and Gurdon; common brick, fire brick, and draintile from Tertiary clay at Whelen Springs. Clay County, common brick made from red clay on Crowleys Ridge, at Rector, Piggott, and Pratt. Cleburne County, alluvial clay used for common brick at Heber Springs. Cleveland County, pressed brick made at Kingsland. Columbia County, surface clays used for common brick at Magnolia and Waldo. Craighead County, common and pressed brick made from clays on Crowleys Ridge at Jonesboro. Cross County, loess and surface clay on Crowleys Ridge used near Wynne. Drew County, alluvial and leached buckshot clays used near Monticello for common brick. Faulkner County, buckshot clays used at Conway. Garland County, alluvial and residual clays, and Carboniferous shales used for common red brick at Hot Springs. Greene County, pressed and common brick made from reworked loess at Paragould and from loess at Gainesville. Hempstead County, surface clay used at Hope, Doyle, and Spring Hill. Hot Spring County, alluvial clay used for common and pressed brick at Malvern; white plastic for white front and paving at Malvern. Howard County, common brick clay, at Nashville. Independence County, red surface clay used for common brick, at Batesville. Jefferson County, alluvial and surface clays used at Pine Bluff and Redfield. Lawrence County, surface clay used for common brick at Walnut Ridge; yellow or reddish clay, at Black Rock; residual clay, at Imboden. Lee County, red brick from loess of Crowleys Ridge, at Marianna. Lincoln County, yellow surface clay used for common brick, at Palmyra. Lonoke County, at Lonoke and Cabot, red surface clays used for common brick. Miller County, Tertiary clays used at Texarkana for pressed and common brick. Mississippi County, yellow alluvial clay used for common brick and draintile at Blytheville. Monroe County, at Brinkley. Nevada County, at Emmet and Prescott, common brick and building tile. Phillips County, common brick made from mixture of surface clay and loess at Helena. Poinsett County, reworked or eroded loess used at Harrisburg for common brick and draintile. Polk County, common brick made from residual clay at Mena. Pope County, residual clay and shale used at Atkins. Prairie County, red surface clay used at Devall Bluff. Pulaski County, surface clay used for common brick at Little Rock. Randolph County, at Pocahontas, common and front brick. St. Francis County, brick clay and yellow loess on and near Crowleys Ridge, burns uniform red; used at Forrest City. Saline County, surface clays used at Benton. Searcy County, residual clays used for common brick at Marshall and Leslie. Sebastian County, Carboniferous shales used at Fort Smith and Mansfield for common and paving brick; alluvial clay near Fort Smith, burns bright red, soft brick, re-pressed for front brick, uniform good color. Sevier County, surface clay used for common brick near Delmar. Union County, red surface clay used at Felsenthal. Washington County, at Prairie Grove, common brick and draintile. White County, argillaceous shales of Round Mountain suitable for sewer pipe and pav