Sandstone (brownstone). A well-known building stone of reddish-brown color; has been quarried at several places in the Triassic rocks of Connecticut Valley.

Sapphire (asteriated). Litchfield County, at Litchfield.

Scheelite (tungsten ore). Fairfield County, has been mined at Trumbull.
Schist. See Whetstone.

Serpentine. New Haven County, has been quarried at Milford.

Siderite (spathic iron ore). Litchfield County, has been mined at Mine Hill, Roxbury.

Slate. Tolland County, quarried in Stafford for local use.

Sphalerite (zinc blende). Fairfield County, Lane's mine, Monroe, and at Brookfield. Middlesex County, Middletown lead mine; in small quantity in pegmatite at Portland and elsewhere.

Spodumene. Fairfield County, in pegmatite at Branchville; crystals commonly very large; some of them altered to cymatolite; associated with numerous rare minerals.

Topaz. Fairfield County, found at Trumbull; Windham County, at Willimantic. Tourmaline. Fairfield County, occurs at Monroe. Middlesex County, found in

quarrying for feldspar at Strickland quarry, Portland; mostly green with a little pink, both of gem quality; gem tourmaline was mined with feldspar at Gillette quarry at Haddam Neck. New Haven County, black, intergrown with quartz at Southford quarry. Black tourmaline in nearly all the pegmatite quarries.

Trap rock (road metal). Fairfield County, quarried at Bridgeport. Hartford County, near Newington, Rocky Hill, and Plainville. Middlesex County, Middlefield. New Haven County, Branford, East Haven, Meriden, Milford, New Haven, and Westville.

Tremolite. Litchfield County, in dolomite at Canaan.

Uraninite (pitchblende). Fairfield County, at Branchville. Middlesex County, at Andrews quarry and Strickland quarry, Portland. Windham County, at Willimantic. At the two quarries in Portland it occurs in amorphous grains and in octahedral crystals, some of the crystals more than onehalf inch in diameter. Occurs nowhere in commercial quantities; only as mineralogic specimens.

Whetstone. Tolland County, mica schist formerly quarried at Bolton and Vernon. Windham County, at Woodstock.

Wolframite (tungstate of iron). Fairfield County, at Lane's mine, Monroe, and in topaz-quartz vein at Trumbull.

DELAWARE.

Asbestos. New Castle County, in serpentine at feldspar quarries northeast of Wilmington; no production.

Brown iron ore (brown hematite, bog iron ore, limonite). Kent County, at East Dover. New Castle County, Iron Hill and Chestnut Hill near Newark, has been mined. Sussex County, Little Creek, 2 miles south of Laurel; near Georgetown; Collins's ore bed on Green Meadow Branch of Deep Creek; Green Branch, 10 miles west of Millsboro; Burtons Branch, 1 mile west of Burton.

Cement material (Portland). Limestone suitable for cement occurs in extreme northern part of State, but outcrops are small. Greensand marl may be used.

Clay (brick). Dug at the following places: Kent County, near Dover, Houston, Smyrna, and Wyoming; New Castle County, at Blackbird, Elsmere Junction, Newark, and elsewhere; Sussex County, Blades, Bridgeville, Dagsboro, and elsewhere.

Clay (fire). New Castle County, New Castle, dug and shipped; used for fire pots and crucibles.

Clay (kaolin). New Castle County, dug at Hockessin and 4 miles north of Newark. Clay (pottery).

New Castle County, was dug at Christiana. Clay (tile). Kent County, near Smyrna Landing.

Corundum. New Castle County, small quantities near Chandlers Hollow. Diatomaceous earth. Somewhat impure; abundant in Calvert formation; not used; outcrops on southern tributaries of Appoquinimink Creek and valley of Hangmans Run.

Feldspar. New Castle County, Tucker's quarry near Wilmington; Tweed's quarry, 2 miles north of Newark, near Pleasant Hill; and Hockessin pits.

Glauconite. See Marl.

Gneiss. Quarried in northern part of State.

Granite. Gneiss and granite are quarried for ballast, building, curbing, concrete, road making, rubble, and riprap at many places in northern part of State.

Infusorial earth. See Diatomaceous earth.

Iron. See Brown iron ore and Ocher.

Kaolin. See Clay.

Limestone. New Castle County, has been quarried at Jeane's, on Pike Creek; Klair's, 2 miles west of Centerville; Bullock's, on Brandywine Creek, near Pennsylvania State line.

Marl (greensand). New Castle County, dug at many localities; occurs in Cretaceous deposits at St. Georges Hundred, St. Georges; 3 miles west of Middletown on Bohemia Creek, at head of tidewater; Cantrell's bridge, north side of Appoquinimink Creek; Silver Run; Dwyers Run; Noxontown Branch of Appoquinimink Creek; Port Penn; Latman's mill, on branch of Dwyers Creek; Scotts Run.

Ocher. Sussex County, with limonite.

Quartz.

New Castle County, white granular quartz has been quarried 21 miles north of Newark and ground at Tweed's mill, near Newark. Road metal. Gravel is abundant in many localities. See also Gneiss, Granite,

and Trap rock.

Sand (building). Large quantity of good quality at many places.

Sand (glass). New Castle County, dug at Christiana.

Sand (molding). New Castle County, dug at Christiana.

Serpentine. New Castle County, occurs 6 miles northwest of Wilmington.

Trap rock. New Castle County, quarried at Wilmington.

DISTRICT OF COLUMBIA.

Clay (brick). Occurs in extreme eastern and southern portion of Washington and at intersection of Bladensburg road and Florida Avenue, in Potomac

and Columbia formations. Washington is supplied by large brickyards
on west side of Potomac River in Virginia.

Clay (terra cotta). Worked extensively for terra-cotta tile at Lamond, Terra
Cotta, and University station, on Metropolitan branch of Baltimore &
Ohio Railroad. Many large masses east of Anacostia River.
Diorite. Has been quarried near Georgetown but is so tough and difficult to
work that little is used; was quarried at east end of Connecticut Avenue
Bridge for concrete used in bridge.

Gneiss. Granite gneiss has been quarried at east end of Chain Bridge and at the receiving reservoir near Chain Bridge.

Granite. Has been quarried on Broad Branch of Rock Creek and along Connecticut Avenue extended.

Quartz. Vein quartz abundant in northwestern part of District; has been crushed for concrete and road material.

Road metal. Granite, diorite, and granite gneiss are abundant and have been crushed for road material. See also Sand and gravel and Quartz. Sand (building). Principal supply dredged from Potomac River. Deposits of Potomac formation have been worked at number of places in Washington and vicinity. Old pit half a mile south of Anacostia; new pit at Benning. Sand under clay at Terra Cotta is used for tempering clay. Dug near Lamond and made into sand-lime brick.

Sand and gravel. For road material and concrete; have been dug at many localities and dredged from Potomac River. Gravel dug at Benning is shipped for Maryland roads.

Soapstone. Half a mile southeast of Tenleytown and one-quarter mile west of Connecticut Avenue on the Albemarle road; formerly quarried on small scale.

FLORIDA.

Brown iron ore. See Limonite.

Cement material. Limestone suitable for cement covers large part of northern Florida; not utilized.

Clay (ball). Along Palatlakaha River. From Lake and Putnam counties is derived the large supply of the United States. It is put on the market as ball clay, but is also termed plastic kaolin by some. Lake County, at Okahumpka and Richmond. Putnam County, at Edgar and Johnson. Clay (brick). Dug in Alachua County, Campville. Clay County, Black Creek, B. P. Landing, and Green Cove Springs. Columbia County, Lake City. Duval County, Jacksonville and St. Nicholas. Escambia County, Brent station, Dolores, Quintette, and elsewhere. Gadsden County, Lawrence. Hillsborough County, Tampa. Holmes County, Eleanor. Lake County, Sorrento and Whitney. Leon County, Tallahassee. Nassau County, Callahan. Walton County, Glendale. Washington County, near Chipley. Occurs but not used in Hamilton County, near Marion, and on Suwannee River at White Springs. Leon County, 18 miles southwest of Tallahassee. Escambia County, dug at Brent station. Floyd County, Flowery Branch. Grady County. Gadsden County, Quincy. Clay (pottery). Lake County, dug at Yalaha, Okahumpka, and Richmond. Putnam County, at Edgar, Johnson, and McMeekin.

Clay (fire). Duval County.

Coquina (limestone). Brevard County, St. Augustine quarries; Rock Ledge on Indian River; used for building stone. St. John County, Anastasia Islands and other points near ocean; used as building stone and road metal.

Diatomaceous earth. Lake County, near Eustis; mined to some extent. Fuller's earth. Gadsden County, dug at Jamieson and Quincy, large deposits. Manatee County, at Ellenton. Occurs in following places but is not mined: Alachua County, Gainesville. Columbia County, High Falls, 8 miles southeast of Lake City. Leon County, 13 miles west of Tallahassee, sec. 26, T. 1 N., R. 3 W. Liberty County, Rock Bluff and along headwaters of Rock and Sweetwater creeks. Florida is now the leading State in the production, having reported for 1914 more than 75 per cent of the total quantity and value.

Gypsum. Sumter County, 6 miles west of Panasoffkee, with limestone. Not

used.

Iron. See Limonite.

Lignite (brown coal). On Suwannee River; has been mined.
Limestone. Alachua County, has been quarried at Gainesville. Dade County,
Miami dolite quarried at Miami for several large buildings, and used also
as road metal. De Soto County, occurs at Charlotte Harbor. Hills-
borough County, Fort Brooke. Jackson County, from Campbellton to
Marianna. Manatee County, Manatee River. Marion County, Kendrick,
Ocala, and Silver Springs. Monroe County, oolite at Key West. Orange
County, Rock Spring. Wakulla County, St. Marks. Occurs also in
Hernando, Holmes, Leon, Walton, and Washington counties. See also
Coquina.

Limestone (lime). Marion County, burned at Ocala and Kendrick.
Limonite (bog iron ore). Duval County, found around Beauclerc. Volusia
County, 12 miles east of Seville, and at several points on the Florida
East Coast Railway.