Sphalerite (zinc blende). Hancock County, occurs sparingly in Blue Hill copper deposits; argentiferous in Gouldsborough mine; has been mined; also found in Eggemoggin, Deer Isle, and other mines, and at Harborside. Somerset County, has been mined at Robinson mine. Washington County, has been mined at Cherryfield; also occurs at Pembroke copper prospect.

Stephanite (silver glance). Hancock County, reported from Sullivan mine.
Syenite. Kennebec County, Litchfield.

Talc (soapstone). Hancock County, Harpswell, Jaquish, Deer Isle. Kennebec
County, Ovis Island, bed 14 feet wide; Vassalboro.

Tin. See Cassiterite.

Topaz. Oxford County, Harndon Hill, town of Stoneham.

Tourmaline. Colored tourmalines of gem quality. Androscoggin County, mined at Apatite Hill, town of Auburn; has been mined at Wade and Pulsifer quarries, town of Auburn, Berry quarry, town of Poland. Oxford County, mined at Mount Mica, town of Paris; has been mined in town of Greenwood, at Mount Rubellite, town of Hebron, Mills quarry, town of Hebron, Dunton quarry, town of Newry. Sagadahoc County, Willes feldspar quarry, town of Topsham.

Trap (trap rock). Cumberland County, a mile south of Hartswell Center, near Brunswick. Hancock County, Brooksville Township, near Brooksville; forms the peninsula west of Bucks Harbor near the village of South Brooksville; in the northern part of the township there are large areas; northwestern part of Deer Isle; Penobscot Township, near Penobscot; Goldsborough Township, at numerous places in southern part, and a belt 2 miles wide extends from a point near Sullivan 7 miles eastward through the village of Goldsborough; east shore of Isle au Haut; Little Deer Island; Mount Desert Island, at many places, especially on landward side, a mile south of Bar Harbor on the east and west sides of Strawberry Hill (quarried); abundant at village of Mount Desert, and on many of the larger islands in Frenchman and Bluehill bays and elsewhere. Knox County, North Isle; North Sullivan Island (mostly composed of trap); St. George Township, mainly in the region extending from Long Cove northeastward beyond the border of the township (quarries near St. George and northeastward); island of Vinal Haven, point west of Carvers Cove, southwest of the village of Vinal Haven (has been quarried); on the north shore of the island from Youngs Point to Hopkins Point, and in the eastern part of the island near Coombs Hill and Barley Hill; Brimstone Island 14 miles southeast of Vinal Haven. Lincoln County, Round Pond. Penobscot County, at Hermon Hill near Bangor (quarried). Waldo County, town of Lincoln, 3 miles west of the coast (quarried), southern part of South Salisbury. Washington County. Addison Township, near Addison (quarried); Calais Township, along the American bank of St. Croix River about a mile southeast of Calais, 24 miles east of Calais; Eastport Township, abundant; city of Eastport (quarried); Shackford Head and Estes Head are the two most favorable occurrences in the State for cheap quarrying and shipment by water; Jonesboro Township, eastern part, notably at Black Head on northeast shore of English Bay; Lubec Township, abundant in eastern part south of Lubec; fine-grained trap constitutes most of Rodgers Island and Dudley Island; coarse diabase, which is exposed abundantly in the village of Lubec and along the west shore of Johnson Bay, forms most of the hills in the region between Lubec village and West Quoddy Head and also in the region

southeast of West Lubec; abundant on Long Island in South Bay and in the vicinity of Bassett Creek and Black Head at the mouth of Federal Harbor; small areas are abundant throughout this part of the township; Machias Township, 14 miles southwest of East Machias; south of East Machias and about half a mile north of Randles Point is a large hill composed of excellent material; 2 miles southeast of Machias, along the south side of the Machiasport road, the trap forms a large hill; smaller outcrops occur all along the road between this hill and Bucks Harbor in Machiasport; just north of the village of Machiasport; Pembroke Township, forms a large hill just north of Ayers Junction, along railroad 2 miles west of junction, at several points along the road from the junction toward Pembroke; in the southern part of the township trap rock forms a chain of hills from one-half to three-fourths of a mile broad extending in a northwesterly direction from East Bay; trap also occurs along the southwest shore of Pennamaquan River about opposite the mouth of Hersey Cove; it forms the hill just west of Garnet Point and the hill east of the mouth of Hersey Cove, and also the ridge just east of Pembroke village; it occupies large areas on the peninsula between Youngs Cove and Falls Island; Perry Township, abundant in southern part, where it forms the hill just southwest of the reservoir dam near Perry village and occupies most of the east shore of East Bay from its head nearly to Birch Point; exposures occur along the Perry and Pembroke roads about one-half mile northwest of the toll bridge to Moose Island; in the northeastern part of the township trap rock is exposed on the hills just north of Perry village; the rock forming the large hill a quarter of a mile southwest of the reservoir dam near Perry would furnish the best road metal. York County, as dikes in nearly every part of the county; Biddeford Township, northern part, at Hollis Beach on south bank of Saco River, 5 miles southeast of the city of Biddeford, and elsewhere; Kennebunkport Township, Cape Porpoise, Redin Island, on the coast east of Kennebunkport; Kittery Township, common as dikes and stocks, near Piscataquis River, about half a mile north of Kittery depot, a quarter of a mile northeast of the Kittery-Portsmouth bridge near the junction of the Portsmouth and the Navy Yard roads (has been quarried); in Wells Township dikes are exposed from Ogunquit to Bald Head, along the coast a mile north of Ogunquit, and opposite Eldridge's hotel along the trolley line.

Tripolite. See Diatomaceous earth.

Vesuvianite. Oxford County, Rumford. Sagadahoc County, Phippsburg. York County, Sanford.

Wad (bog manganese). Occurs in Aroostook County, at Hodgdon. Hancock County, at Blue Hill (mined). Knox County, at Thomaston, on Dodges Mount. Oxford County, at Sumner. Piscataquis County, at Dover. York County, at Mount Agamenticus.

MARYLAND.

Antimony. See Stibnite.

Asbestos (chrysotile). Baltimore and Harford counties, small, inferior deposits of fibrous serpentine have been quarried at several places. Cecil County, at West Nottingham.

Barite. Carroll and Frederick counties, lens-shaped bodies have been found. Bornite (peacock copper). Carroll County, occurs at Mineral Hill, 7 miles southwest of Finksburg and near New Windsor. Frederick County, mined at Liberty mine between Union Bridge and Libertytown; occurs in Linganore copper region.

Brown iron ore (bog iron ore). Found at several localities in small quantity. Was mined and made into pig iron many years ago at Federalsburg, Caroline County, and on Nassawango Creek, Worcester County, latter locality producing as high as 700 tons in one year.

Brown iron ore (brown hematite, limonite). Was formerly mined more or less extensively at the following places: Allegany County, Nicholas Mountain and Shriver Ridge. Baltimore County, near Bosley, 2 miles west of Cockeysville, 2 miles west of Glencoe, near Lutherville, Stevenson, and Towson. Carroll County, at Avondale, Bachman Mills, Ebbvale, Lineboro, Melrose, and Westminster. Frederick County, east foot of Catoctin Mountains near Thurmont, near Feagaville, Frederick Junction, Unionville, and Washington Junction. Harford County, at Hess, and 2 miles southwest of Jarrettsville. Washington County, 1 mile south of Boonsboro, 3 miles north and 4 miles southwest of Clear Spring, 1 mile and 3 miles northwest of Harpers Ferry, near Green Spring, 2 miles northeast and 1 mile southeast of Indian Spring, 1 mile and 2 miles south of Pondsville.

Calamine (zinc silicate). Carroll County, zinc mines near New Windsor, with sphalerite and smithsonite, not worked.

Cement (natural). Allegany County, Silurian limestone used for natural cement at Cumberland and Potomac. Baltimore County, Cockeysville

and Texas. Carroll County, vicinity of Union Bridge. Washington County, at Cavetown, Cayuga, Chewsville, Hagerstown, Hancock, and Tonoloway station.

Cement material (Portland). Allegany County, has been quarried at Cumberland and Pinto. Frederick County, Ordovician limestone suitable for Portland cement lies along Monocacy River in east-central part of county. Washington County, same rock in two belts, one north and south through center and one in east third of county, has been quarried at Round Top. Chalcocite (copper sulphide). Baltimore County, occurs at Bare Hills and Dolly Hyde mines. Carroll County, has been mined at Mineral Hill mine and Roop farm. Frederick County, mined occasionally at Liberty mine. Chromite (chromic iron ore). Baltimore County, has been mined at Bare Hills

and Soldiers Delight. Carroll County, occurs in a belt from near New
Lisbon, through Montgomery County, nearly to Potomac River. Cecil
County, formerly mined in small way along State line near Rock Springs.
Harford County, was mined at several points in serpentine. Montgomery
County, near headwaters of Seneca Creek in serpentine.

Chromium. See Chromite.

Chrysocolla (copper silicate). Carroll County, sparingly in red sandstone between Middleburg and Big Pipe Creek.

Clay (brick and tile). Clay suitable for the manufacture of brick and tile is common throughout the State. Common brick are made from sedimentary clays of the Coastal Plain, residual clays of the Piedmont region, and shaly deposits of the Appalachian region. There are 67 brick, tile, and terra-cotta works in the State, including 4 at Baltimore, 2 at Cambridge, 5 at Hagerstown, 3 at Salisbury, 3 at Westminster, and one or more at many localities in 16 different counties.

Clay (fire). Allegany County, worked at Cumberland, Frostburg, and Mount Savage. Anne Arundel County. Baltimore County, Pleistocene, also residual clays of Algonkian, worked at 4 places. Cecil County, 4 yards near Northeast. Frederick County, 1 yard at Frederick. Garrett County, Blaine. Harford County. Howard County. Prince George County. Wicomico County, 1 yard at Salisbury.

Clay (kaolin). Baltimore County. Calvert County, near Drum Point and St.
Leonard Creek. Cecil County, residual, white, derived from feldspathic
gneisses, is used chiefly in manufacture of paper. Howard County.
Clay (pottery). Anne Arundel County, important outcrops along western shore
of Chesapeake Bay from Bodkin Point southward. Cecil County, found
at many places in Patapsco formation. Pottery clay is worked near Bal-
timore, Catonsville, Cumberland, Frederick, and Hagerstown.
Coal (bituminous). Occurs in five basins, known as Castleman, Georges Creek,
Upper Potomac, Lower Youghiogheny, and Upper Youghiogheny, all in
Allegany and Garrett counties; Pittsburg principal seam, mines from
Frostburg to Midland; Ocean, Union, and Carlos largest mines; lower
beds of Allegheny formation extensively mined from Moscow to Western-
port, at Loarville, Barrellville, and along west bank Potomac River on
east border of Garrett County; Lower Kittanning coal (in Allegheny
formation), 6 feet, mined North Potomac Valley; Mercer coal bed (in
Pottsville formation), 2-4 feet, mined for firing brick at Mount Savage,
also mined to slight extent near Westernport; Pittsburg coal (in Monon-
gahela formation), 5-20 feet, extensively mined in Georges Creek district;
high-grade steam and blacksmith coal.

Copper (native). Frederick County, Catoctin Mountain, specimens only.
Copper ores. See Bornite, Chalcocite, Chrysocolla, and Malachite.
Diabase. See Road metal.

Diatomaceous earth. Bed 30 feet thick at base of Miocene has been traced from Herring Bay on the Chesapeake to Popes Creek on the Potomac, across Anne Arundel, Calvert, and Charles counties; has been dug for polishing powder; chief production at Lyons Creek on Patuxent River, Anne Arundel County.

Dolomite. Quarried in Baltimore County, and near Hagerstown, Washington

County.

Feldspar. Baltimore County, orthoclase and microcline mined near Woodstock, Granite, and Hollofield, and across the line in Howard County. Montgomery County, 4 miles west of Laurel, microcline mined. Cecil County, soda feldspar (albite) mined near Conowingo.

Flagstone. Frederick County, Catoctin Mountain, Emmitsburg, High Knob, near Frederick.

Flint. See Quartz.

Fluorspar (fluorite). Allegany County, occurs near Cumberland.

Gabbro. Baltimore County, quarried at Dickeyville and Woodberry. Harford County, near Havre de Grace. Howard County, Savage. See also Road metal.

Galena (lead ore). Baltimore County, traces in Jones Falls quarries. Carroll County, with limestone in western part of Carroll and eastern part of Frederick County. Montgomery County, has been mined for gold in Maryland mine at Great Falls.

Glauconite. See Marl (greensand).

Gneiss. Quarried at Baltimore, and in Baltimore County at Loch Haven, Pikesville, Phoenix, Stevenson, and opposite Ellicott City.

Gold. Baltimore County, found in quartz veins at Catonsville. Carroll County, found in small quantity at Mineral Hill. Montgomery County, was mined with pyrite, galena, etc., at Great Falls and Glen Echo.

Granite. Baltimore County, Dickeyville, Gardenville, Granite, Raspeburg, Reisterstown, Towson, and Whitehall. Baltimore City, Baltimore. Cecil County, quarried extensively at Frenchtown, Port Deposit, Rising Sun, and Rowlandsville. Harford County, Havre de Grace. Howard County, Ellicott City, Guilford, and Savage. Montgomery County, Dickerson, Forest Glen, and Glen Echo.

Hematite (Clinton oolite). Allegany County, was stripped many years ago on west side of Wills Mountain, near Roberts and near Cumberland; it occurs in Wills Mountain, Evitts Mountain, and Tussey Mountain. Hematite (specularite). Carroll County, was formerly mined at Springfield and Carroll mines near Sykesville, Mineral Hill mine near Louisville, and Patapsco mines at Finksburg.

Iron ores.

See Brown iron ore, Chromite, Hematite, Magnetite, Oriskany brown ore, Pyrite, Pyrrhotite, and Siderite.

Limestone (building). Allegany County, Cresaptown and Mount Savage. Baltimore County, Belfast and Loch Raven. Washington County, Sharpsburg. Very little limestone is quarried for dimension building stone. Small quantities are taken at a few places for local use.

Limestone (crushed stone). Quarried: Allegany County, at Cumberland. Baltimore County, Baltimore, Glyndon. Frederick County, Catoctin Furnace,, Frederick, Lime Kiln. Washington County, Cavetown, near Hagerstown, at Maugansville, Pinesburg, and elsewhere.

Limestone (lime). Quarries where stone is or formerly was procured to burn for lime: Allegany County, Cumberland and near Allegany Grove. Baltimore County, Butler, Dover, Glyndon, and Texas. Carroll County, Avondale, Linwood, Uniontown, Union Bridge, near Westminster, and elsewhere. Frederick County, Buckeystown, Catoctin Furnace, Daysville, Mount Pleasant, Mount Savage, and elsewhere. Howard County, Clarkville, Fulton, and Highland. Washington County, Cavetown, Cayuga, Chewsville, Clear Spring, Hagerstown, Pinesburg, and elsewhere. Limonite. See Brown iron ore.

Linnæite (siegenite, cobalt pyrites). Carroll County, Mineral Hill copper mines, Finksburg, in small quantities with copper ores in chlorite schist. Magnetite. Baltimore County, was mined 1 mile southeast and 24 miles northeast of Whitehall. Frederick County, 15,000 tons or more of ore was taken on hill southwest of Catoctin Furnace, near Thurmont. Harford County, small quantity was mined 1 mile southeast of Minefield. Besides these places where magnetite has been mined, there are several mines and prospects where it has been found in very small quantity or might be found by driving through the limonite cap.