Titanium. See Ilmenite, Rutile, and Perofskite.

Topaz. Chaffee County, Mount Antero and Ruby Mountain; on east side of Arkansas River, near Nathrop. El Paso County, Crystal Park, 2 miles southwest of Manitou Springs. Lake County, at Chalk Mountain, near Leadville. San Juan County, found occasionally. Teller County, at Pikes Peak, and mined intermittently at Crystal Peak, 4 miles north of Florissant.

Tourmaline. Fremont County, 2 miles north of Royal Gorge and 5 miles northwest of Canon City; opaque but colored. Gilpin County, near Blackhawk. Larimer County, Estes Park. Teller County, Rhyolite Mountain.

Trona. Deposits estimated at 100,000 tons or more in the soda lakes of the San Luis Valley; some development done. Sparingly in other alkali lakes and areas.

Tungsten. See Ferberite, Hübnerite, and Scheelite.

Turquoise. Conejos County, 13 miles east of La Jara. Eagle County, Mount of Holy Cross. Mineral County, Last Chance mine, Creede. Saguache County, near Villa Grove.

Uranium minerals. See Carnotite and Pitchblende.

Uraninite.

Vanadinite.

Vanadium.

See Pitchblende.

Montrose and San Miguel counties.

Found in many localities as carnotite, roscoelite, calciovolborthite, and possibly volborthite. Custer County, 7 or 8 miles southeast of Silver Cliff, reported to occur as in Huerfano County. Eagle County, with silver ores in sandstone on Brush Creek; form of mineral unknown. Huerfano County, in an unidentified mineral near head of Pass Creek, south of Malachite. Montrose County, found in the Paradox Valley country as calcium vanadate; possibly two forms; unnamed, awaiting future investigation. See also Volborthite.

Vesuvianite. Mount Italia, and north of Arkansas River in granite.
Vivianite. Leadville.

Volborthite. Huerfano County, near head of Pass Creek, south of Malachite. The mineral has not been definitely identified but is probably either volborthite or calciovolborthite, or both. La Plata County, Boren Gulch; vanadium occurs in a quartz vein in a mineral which is probably volborthite or calciovolborthite, and also in an amorphous yellowish-green mineral. Park County, reported from Garo.

Volcanic ash. Exists in enormous quantity in several of the eastern counties. La Plata County, near Durango. Teller County, Cripple Creek. Yuma County, has been shipped from Wray for scouring powder.

Wood (opalized). El Paso County, has been obtained in eastern part of county with jasperized wood; Bijou basin. Silicified wood is very common. Yttrium. See Allanite and Gadolinite.

Zeolites.

Jefferson County, Table Mountain, near Golden.

Zinc. Fremont County, predominant metal in Currant Creek (Micanite) district. See also Aurichalcite, Calamine, Chalcophanite, Heterolite, Hydrozincite, Nicholsonite, Smithsonite, and Sphalerite.

Zircon. St. Peters Dome, near Pikes Peak.

CONNECTICUT.

Agate. Hartford County, at Farmington. New Haven County, at East Haven. Litchfield County, at Woodbury; has been cut for seal stones. In dif

ferent localities in amygdules in the trap.

Almandite. Litchfield County, Roxbury.

Amethyst.
Aquamarine.

Occurs occasionally in amygdules in trap at Meriden.

Middlesex County, some of gem quality has been found in Portland and Haddam. See also Beryl.

Arsenopyrite (arsenical pyrite). Fairfield County, in lead mine in Wilton and at Lanes mine, Monroe, Middlesex County, in small quantities at the old Cobalt-Nickel mine, in Chatham. New Haven County, in mine at Derby and in Oxford and Bethany.

Asbestos (actinolite). Litchfield County, at New Hartford and Barkhamsted. Azurite (blue carbonate of copper). Hartford County, in small quantities at Rocky Hill near Hartford; also at other copper deposits.

Barite. New Haven County, in Triassic sandstone in Cheshire and in small quantities elsewhere. The Cheshire barite was formerly mined to mix with white-lead paint.

Basalt.

Beryl.

See Trap rock.

Fairfield County, at Branchville. Litchfield County, gem golden beryl and aquamarine were mined with mica and feldspar 6 miles north of New Milford. Middlesex County, abundant in the pegmatite at several quarries in Middletown, Portland, Chatham, and Haddam; gem aquamarine found in some of these, especially in Portland and Haddam. New Haven County, found in Southford quarry. Bismuth (native). Fairfield County, small quantities associated with arsenopyrite, pyrite, wolframite, and other minerals, in quartz vein at Monroe. Bismuthinite. Middlesex County, with chrysoberyl in minute quantities at

Haddam, and sparingly in a pegmatite dike at a small feldspar quarry formerly worked in Portland. Bornite (variegated copper). Hartford County, at Bristol copper mine, Bristol. Litchfield County, with chalcocite and malachite at Wolcottville and elsewhere; occurs in quartz veinlets in Rocky Hill quarry at Winsted. New Haven County, occurs with diabase at Mount Carmel, Hamden. Brown iron ore (bog iron ore, limonite). Litchfield County, mined at Davis and Orehill mines, near Lakeville; large deposits at Sharon and Salisbury have been mined. New London County, occurs at Colchester. Tolland County, bog iron mined and smelted in Stafford and Hebron townships. Windham County, at Woodstock.

Calamine (silicate of zinc). Fairfield County, with galena at Brookfield.
Cassiterite (tin ore). Middlesex County, few crystals found at Haddam.
Cement material. Outcrops of suitable limestone are small and few.
Cerium. See Monazite.

Cerusite (lead carbonate). Fairfield County, on galena at Brookfield.
Chalcocite (copper glance). Hartford County, was mined in very small quan-

tity at Simsbury mine, Granby; splendid crystals formerly obtained in Bristol mine at Bristol; Tallwaa mine, Hampden. Litchfield County, with bornite and malachite, Wolcottville. New Haven County, occurs in southeastern part of Cheshire and in Hamden.

Chalcopyrite (copper pyrites). Fairfield County, in various places in Trumbull. Hartford County, Bristol, in granite gneiss. Litchfield County, with

27608°-Bull. 624-17-7

pyrrhotite at Mine Hill. Middlesex County, in Middletown lead mine. New Haven County, near Lamberts mine, Orange, and in small quantities at other places.

Chrysoberyl.

Middlesex County, crystals at Haddam, little of gem quality. Locality has been inaccessible in recent years.

Clay (brick). Occurs abundantly; has been used in following districts: Berlin, Clayton, Cromwell, Elmwood, Hartford, Kensington, Middletown, Milldale, New Haven, Parkville, Quinnipiac, South Windsor, Thompsonville, and Windsor.

Clay (fire). Litchfield County, has been dug 2 miles south-southwest of Boardmans Bridge.

Clay (kaolin). Fairfield County, has been found at Sherman. Hartford County, at Granby. Litchfield County, dug at West Cornwall and shipped to potteries outside of State; occurs also at New Milford and Kent. Columbite. Hartford County, with feldspar, near Glastonbury. Middlesex County, found in several feldspar quarries in Middletown, Portland, and Haddam. A large quantity found some years ago at one quarry in Portland no longer worked.

Copper (native). Hartford County, small quantities at Farmington.

New

Haven County, occasionally found in Triassic sandstone or trap, Hamden, Copper minerals. See Azurite, Bornite, Chalcocite, Chalcopyrite, Cuprite, and

Malachite.

Cordierite. Middlesex County, has been found at Haddam Neck.

Corundum. Litchfield County, found near Barkhamsted; with talc and pyrite at Litchfield. New London County, sparingly, with sillimanite near Norwich. Not mined.

Cuprite. Hartford County, Simsbury mine, Granby, very small quantity.
Diabase. See Trap rock.

Dolomite. Abundant; was quarried at New Preston. See also Marble. Feldspar (orthoclase or microcline). Fairfield County, occurs at Branchville, ground and shipped out of State for manufacture of porcelain. Hartford County, several quarries have been worked south of Glastonbury; Howe quarry, 2 miles south of South Glastonbury. Middlesex County, numerous quarries, large and small, worked for longer or shorter times, in the pegmatites of Middletown, Portland, Haddam, and Chatham. New Haven County, mined near Southford.

Flagstone.

Fairfield County, gneiss or schist near Bridgeport. Hartford County, red sandstone quarried at Enfield. Litchfield County, at Roxbury. Middlesex County, gneiss quarries on Connecticut River, at Middletown, Chatham, and Haddam. New London County, large flags quarried in Lebanon. Tolland County, mica schist of Bolton Mountain, formerly quarried extensively. Windham County, micaceous quartzites formerly quarried at Killingly.

Fluorspar (fluorite). Fairfield County, in topaz vein in Trumbull, used for flux. Litchfield County, at Plymouth. Middlesex County, Haddam Neck, and at the old lead-silver mine, Middletown. Windham County, in gneiss at Willimantic. Nowhere in considerable quantity except at Trumbull.

Galena. Fairfield County, in limestone at Brookfield, in quartz veins at Monroe. Hartford County, at Chatham. Middlesex County, with sphalerite, chalcopyrite, and pyrite at Middletown. Several other localities. Was mined for lead in colonial and Revolutionary times; for a few years, about 1860, mined for silver.

Garnet. Hartford County, quarry near South Glastonbury. Litchfield County, was mined at Roxbury as abrasive. Middlesex County, small garnets in pegmatite at Andrews quarry, Portland, and in Eureka quarry. New Haven County, in Southford quarry. In larger or smaller quantities at most of the pegmatite (feldspar) quarries.

Gneiss.

Quarried for foundation stone at many places. Hartford County, Glastonbury. Middlesex County, at Haddam, quarried for curbstone. New London County, at quarries on Thames River above New London. Tolland County, at Union. Windham County, at Plainfield, Willimantic, and Putnam.

Granite (building, structural). Quarried at Branford, Bristol, Center Groton, Danbury, East Derby, East Glastonbury, Essex, East Lyme, Greenwich, Groton, Guilford, Haddam, Leete Island, Lyme, Middletown, Mystic, New London, Niantic, Norfolk, Oneco, Plainfield, Quaker Hill, Roxbury, Sachem Head, Seymour, South Manchester, Sterling, Stony Creek, Stonington, Thomaston, Torrington, Wallingford, West Mystic, and West Torrington. Much of the granite quarried is a granite gneiss.

Granite (curbing and trimming). Quarried at Ansonia, Bolton, Bridgeport, Cornwall, East Litchfield, Glastonbury, Norwalk, Roxbury, Seymour, Sterling, Torrington, Waterford, and Willimantic.

Granite (inscriptional, monumental). At Center Groton. East Lyme, Groton, Lyme, Stonington, Thomaston, and Waterford.

Granite (paving). At Guilford and Sterling.

Granite (riprap). At Sachem Head, Guilford, Mason Island, Stonington. Granite (road material). At Bridgeport jail, Danbury, Torrington, Town Hill. Graphite. Fairfield County, at Danbury and Redding. Litchfield County, found in western part of Cornwall. New Haven County, in northern part of Bethany. Windham County, has been quarried in northwest corner of Ashford.

Grindstone. Hartford County, fine-grained quartzose mica slate was quarried in Marlborough; not now produced.

Iron minerals. See Brown iron ore, Magnetite, Pyrite, Pyrrhotite, and Siderite. Kaolin. See Clay (kaolin).

Lead minerals. See Cerusite, Galena, and Pyromorphite.

Lepidolite. Middlesex County; the largest quantity of lepidolite which has been found was obtained at Chatham in a pegmatite dike in the south part of the town, where it is abundant in granular masses. Some years

ago it was quarried and exported for the manufacture of lithium salts; fine granular masses in pegmatite at Haddam and Middletown; larger plates or crystals in pegmatite at Portland and Haddam. Limestone (crushed stone). Litchfield County, quarried at Canaan. Limestone (flux). Litchfield County, was quarried at East Canaan. Limestone (hydraulic). Hartford County, near Berlin, in Southington; in thin strata, compact, earthy, and somewhat bituminous. New Haven County, Northford, a gray limestone.

Limestone (lime). Fairfield County, magnesian limestone burned near Redding, Brookfield, Ridgefield, and Danbury; Litchfield County, at Canaan. Limonite. See Brown iron ore.

Magnetite (magnetic iron ore). Fairfield County, was mined and smelted in

small quantities at New Preston and at Redding. Litchfield County, in Sharon Township. Middlesex County, near Haddam. New Haven County, northwest of Madison. Winchester County, in northwest corner.

Malachite (green carbonate of copper).

Hartford County, principal ore at Simsbury mine, Granby, but not abundant. Disseminated through sandstone.

Marble. Litchfield County, old quarries in East Canaan and Marbledale. See also Dolomite.

Mica (muscovite). Fairfield County, found with topaz at Trumbull. Litchfield County, was mined with feldspar and beryl 6 miles north of New Milford. Middlesex County, small quantities mined with feldspar in Middletown, Portland, Haddam, and elsewhere in pegmatites, mostly scrap mica for grinding but some suitable for glazing and insulating.

Mineral paint. Fairfield County, soapstone ground at Greenwich; asbestos rock at Stamford; talcose slate at Wilton. Litchfield County, soapstone ground at Barkhamsted.

Molybdenite (sulphide of molybdenum). Hartford County, in pegmatite at South Glastonbury. Middlesex County, in gneiss quarries at Haddam. Monazite.

Middlesex County, crystals in pegmatite at Andrews's quarry, Portland (no longer worked). New London County, in small crystals with sillimanite at Norwich. Nowhere in commercial quantities.

Peat. In fresh and salt water swamps and marshes in nearly every county in the State. Air-dried machine peat fuel has been produced recently at New Haven. Artificially dried peat fuel and peat charcoal are made in a small plant near Hartford.

Pitchblende. See Uraninite.

Pyrite. Fairfield County, at Newtown.

Hartford County, in slate at Windsor. Litchfield County, at Winchester. New Haven County, near North Madison. Small quantities in other localities; not now produced. Pyromorphite (green lead ore). Fairfield County, with galena at Brookfield. Pyrrhotite. Fairfield County, small quantity mined at New Fairfield.

Litch

field County, occurs with chalcopyrite and pyrite at Prospect Hill, Bradleyville. Middlesex County, in small quantities in pegmatite at Portland and elsewhere.

Quartz. New London County, at Long Hill and Lantern Hill, North Stonington. Litchfield County, at Canaan, 2 miles east of Roxbury station, and 3 miles north of Litchfield. New Haven County, quarried near Southford. The pegmatites of Portland and other places are worked chiefly for feldspar, but the quartz is also ground and used for different purposes. Rose quartz has been found in pegmatite at Portland and Chatham.

Radium. See Uraninite.

Road metal. See Granite, Limestone, and Trap rock.

Rutile. Fairfield County, at North Greenwich; has been mined in small quantities at Monroe. Hartford County, at Granby. Litchfield County, at Plymouth.

Sand (building). Hartford County, at Plainville, New Britain, and Windsor Locks. Dug in small quantity at other places.

Sand (molding). Hartford County, New Britain and Windsor Locks. Sandstone. Ranges from nearly white to brick-red and dull brown; formerly quarried at all places named. Hartford County, Avon, Buckland, and Tariffville. Middlesex County, at Cromwell, Portland (now quarried). New Haven County, at East Haven. Also at other localities in the Triassic area. This area extends along both sides of Connecticut River from northern boundary of State to Middletown; thence it extends southwestward to New Haven.