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Malachite (green carbonate of copper). In Blue Ridge district and crystalline rocks of Frederick, Carroll, Howard, and Baltimore counties. Liberty mine, Frederick County, only producer.

Manganese ore (mined). Reported in small quantities in Cambrian and Ordovician rocks at following localities: Allegany County, Keysers Ridge and Bear Creek, Youghiogheny Valley. Frederick County, New Market, associated with copper. Montgomery County, at Brookville and Mechanicsville. Washington County, north shore of the Potomac, 3 miles north of Harpers Ferry; pyrolusite has been mined. See also Pyrolusite. Manganite. Occurs in small quantity, from indeterminable amounts to 10 per cent of the ore, in most manganese deposits in the State.

Marble. Baltimore County, at Cockeysville, fine dolomitic marble quarried for building and decorative purposes; at Texas, coarse grained, quarried for flux and lime. Carroll County, a few miles south of Union Bridge, variegated marble suitable for decoration; development work begun. Frederick County, Liberty, New Market, Sams Creek, variegated; east slope Catoctin Mountain, "Potomac or calico marble"; valley of Monocacy River. Washington County, Eakles Mills and Boonsboro, cream-colored and variegated has been quarried; Benevola and Hagerstown, quarried. Marl (greensand). Glauconitic, occurs abundantly in Anne Arundel, Charles, Kent, and Prince Georges counties.

Marl (shell). Occurs abundantly in Calvert, Caroline, Queen Annes, St. Marys, and Talbot counties. Caroline County, deposit in bank of Choptank River, near Denton, has been used for road material.

Mica (muscovite). Baltimore County, with quartz and feldspar in quarry near Hollofield station. Howard County, has been mined 5 miles northeast of Laurel and 14 miles north of Scaggsville and near Woodstock. Montgomery County, prospects 4 miles northwest of Laurel on south side of Patuxent River.

Ocher. Anne Arundel and Prince Georges counties, was formerly mined from Patapsco and Arundel formations. Frederick County, considerable shipments from Catoctin Furnace pits.

Oriskany brown ore. Western part of State.

Pyrite. Anne Arundel County, in Magothy formation on Magothy River, was roasted for sulphuric acid. Montgomery County, abundant in quartz at Maryland mine near Great Falls. Prince Georges County, Oxon Creek, was mined for gold.

Pyrolusite. Frederick County, near Point of Rocks. Montgomery County, Brookville, abandoned mines. Washington County, was mined on north shore of Potomac River, 3 miles north of Harpers Ferry. Pyrrhotite. Howard County, in small quantities with hornblende, near Woodstock.

Quartz. Baltimore County, quarried at Glen Morris and Woodstock. Carroll County, Louisville. Harford County, Flintville, Deer Creek, and 14 miles west of Conowingo (Cecil County). Howard County, Marriotsville; all ground for use in pottery manufacture. Montgomery County, mined 4 miles west of Laurel with mica and feldspar.

Road metal. Gabbro, extensive in Baltimore, Cecil, Harford, Howard, and Montgomery counties; diabase, long narrow outcrops in Baltimore and Howard counties, more extensive in Frederick and Montgomery counties; marble, limestone, and sandstone, extensive in valleys north of Baltimore City, and in Frederick and Hagerstown valleys: gravels and marls, Anne

Arundel, Calvert, Cecil, Charles, Kent, Prince Georges, Queen Annes, and
Talbot counties.

Sand (building). Anne Arundel and Baltimore counties, dug and dredged near
Baltimore. Prince Georges County, Farmington. Washington County,
Hancock and opposite Great Cacapon, W. Va.

Sand (glass). Anne Arundel County, dug at Robinson, has been worked on both banks of upper part of Severn River.

Sand (molding). Anne Arundel County, dug at Magothy River. Baltimore County, Catonsville. Washington County, Rock Forge. Found also in Cecil, Harford, and Kent counties.

Sandstone (building). Quarried in small quantity in Allegany County, at Cumberland. Baltimore County, Lystra (mail Stevenson). Carroll County, Kump and Taneytown. Garrett County, Bloomington. Montgomery County, near mouth of Seneca Creek. Washington County, Hancock. Sandstone (crushed stone). Allegany County, quarried at Cumberland. Garrett County, Bloomington.

Serpentine. Baltimore County, quarried at Bare Hills and Reistertown. Cecil County, forms wall rock at West Nottingham quarry. Harford County, quarried at Dublin, has been quarried at Broad Creek, near Cambria, at Coopstown, and Deer Creek.

Siderite (spathic iron ore). Confined to Cretaceous deposits of Coastal Plain; found in Anne Arundel, Baltimore, Cecil, and Prince Georges counties; ore occurs in lenses in clay. A large number of ore banks are found on a line from Poplar, through Baltimore, Eldridge, Annapolis Junction, and Muirkirk, to Branchville.

Silver.
Slate.

Frederick County, Catoctin Furnace, in sphalerite and galena.

Frederick County, has been quarried at Ijamsville and Bennett Creek, near Thurston. Harford County, quarried for roofing in Peachbottom area, Cardiff. Montgomery County, occurs at Hyattstown.

Smithsonite (carbonate of zinc). Carroll County, zinc mine near New Windsor, with sphalerite and calamine; has been mined.

Soapstone. Small quantity sawn into slabs, more ground for acid-proof and fireproof paints. Carroll County, quarried from extensive deposit northwest of Marriottsville; small quantity ground near Westminster. Cecil County, Patersons, on west branch of Northeast River; New Leeds, on Little Elk. Harford County, soapstone occurs but quarrying abandoned. Montgomery County, near Clopper's mills, Rockville, and Smell's bridge. Sphalerite (zinc blende). With crystalline limestone in west part of Carroll County and east part of Frederick County.

Stibnite. Frederick County, Middletown Valley.

Talc (French chalk). Cecil County, Rock Springs, in serpentine; Montgomery County, 6 miles from Rockville on Darnestown road.

Tetradymite. Montgomery County, has been mined with gold in Great Falls mines.

Tourmaline. Montgomery County, chrome tourmaline near Etchison.

Verde antique. See Serpentine.

Zaratite (emerald nickel). Cecil County, small quantity in chrome ore mine in northern part of county.

Zinc. See Calamine, Smithsonite, and Sphalerite.

MASSACHUSETTS.

Alum. Dukes County, lignitic clays in vicinity of Gay Head and elsewhere on Marthas Vineyard, once shipped to Salem for alum.

Anthracite. See Coal.

Aquamarine. Found at Royalston and Fitchburg. See also Beryl.

Asbestos. Berkshire County, was mined in connection with talc at Dalton. Hampshire County, mined near Pelham.

Basalt. See Trap rock.

Beryl. Worcester County, at Royalston, best locality in State, blue and yellow gem quality, worked intermittently. Found also in Franklin County at Northfield. Hampden County, Blandford. Hampshire County, Chesterfield, Goshen, and Norwich.

Beryl (emerald). Hampshire County, reported specimens found at Chesterfield and Goshen.

Brown iron ore (limonite, bog iron ore). Dukes County, deposits in swamps and in Tertiary rocks in Marthas Vineyard. Hampden County, formerly worked near Brimfield. Brown iron ore (brown hematite). Berkshire County, numerous and extensive beds in Richmond, has been mined to some extent; also in vicinity of Lenox and Stockbridge, and in an area which extends 6 or 7 miles northward from these towns toward Pittsfield, it has been mined at a dozen or more places. Bristol County, large quantities at Dartmouth and Easton; has been mined at West Stockbridge.

Cement material (Portland). Suitable limestone occurs in northwest part of State, particularly Berkshire County, but no shales occur near these limestones, and the glacial clays are too sandy. Chalcopyrite (copper pyrites). Essex County, with galena, pyrite, etc., middle vein, Newburyport lead mines. Franklin County, occurs in very small quantity at Davis, Greenfield, Leverett, Montague, and elsewhere; was shipped from Davis mine. Hampshire County, Loudville and Southampton. Worcester County, with siderite in mica slate at Sterling. Chiastolite. Worcester County, good specimen locality in argillaceous slate at Westford and Lancaster; abundant gem quality, some cut.

Chromite (chromic iron ore). Hampden County, in serpentine at Chester, three outcrops 5 to 18 inches wide; 1,200 pounds of ore once obtained.

Chromium. See Chromite.

Clay (brick). Dug in following places: Barnstable County, at West Barnstable. Berkshire County, Braytonville. Bristol County, near Taunton. Dukes County, Gay Head. Essex County, Danvers, Danversport, Salisbury, and elsewhere. Franklin County, Turners Falls, Montague City, and elsewhere. Hampton County, Springfield, West Brimfield, and Williamsette. Hampshire County, Amherst, Easthampton, Northampton, and elsewhere. Middlesex County, Belmont, Cambridge, and Medford. Plymouth County, Bridgewater, Middleboro, Plymouth, and elsewhere. Suffolk County, Chelsea and Revere. Worcester County, East Brookfield, South Fitchburg, Still River, and elsewhere.

Clay (fire). Dug in Bristol County, at Fall River. Dukes County, Chilmark,
Gay Head, and Mahonikey.

Clay (kaolin). Berkshire County, occurs 4 miles
County, occurs at Gay Head and elsewhere.
Blandford.

south of Clayton. Dukes

Hampden County, dug at

Clay (plastic). Barnstable County, occurs at Truro on Cape Cod. Dukes County, abundant in southeastern part of Chilmark and at Gay Head, Marthas Vineyard. Nantucket County, Nantucket. Plymouth County, beneath sands at Duxbury.

Clay (pottery). Dukes County, underlies district from Tisbury Brook westward to cliffs at Gay Head, Marthas Vineyard, mined at Gay Head. Essex County, mined at Danvers; shipped, not used locally.

Coal (anthracite). The Rhode Island coal field extends northeast into this State and small quantities of coal were mined years ago in Bristol County, at Mansfield; Norfolk County, at Wrentham; Plymouth County, at Middleboro and West Bridgewater. The coal is graphitic and not suitable for domestic fuel. The so-called coal at Worcester is graphitic phyllite and that on the bank of Agawam River at West Springfield is of somewhat the same character. See also Lignite.

Corundum (emery). Hampden County, has been mined in vicinity of Chester, at Sacket, Wright, and other mines, and with asbestos at Pelham. Hampshire County, Chesterfield.

Cyanite.

Diabase. See Trap rock.

Diatomaceous earth. Middlesex County, has been mined at Framingham.
Emerald. See Beryl.

Emery. See Corundum.

Feldspar. Hampden County, small quantities quarried near Blandford. Flagstone. Berkshire County, Washington. Franklin County, Montague, red micaceous sandstone was quarried. Hampshire County, has been quarried at several places near Chesterfield and Goshen.

Fluorspar. Franklin County, occurs at Conway, Deerfield, and Northfield; Hampshire County, occurs in Southampton lead mine, near Northampton, and West Springfield.

Fuller's earth. Worcester County, produced at Lancaster.
Galena. Hampden County, was formerly mined at Montgomery.

Hampshire

County, argentiferous galena in masses to more than 1 foot in diameter were found in Southampton lead mine.

Garnet.

Franklin County, many stones almost suitable for cutting on Northfield Mountain. Hampden County, fine crystals at Chester and Russell; large quantity was obtained from Russell.

Gneiss. Franklin County, has been quarried at Montague. Hampden County, Wilbraham and Monson. Worcester County, Boylston, Dudley, Milbury, Westboro, and Uxbridge.

Granite. Quarried at following places for building, monuments, paving, road metal, and other uses: Berkshire County, Becket, Chester (near), Lenox, Lenoxdale, and Stockbridge. Bristol County, Dartmouth and North Dartmouth, Fall River, New Bedford, and near Mattapoisett. Essex County, Annisquam, Beverly Farms, Gloucester, Haverhill, Lanesville, Lawrence, Lynn, Lynnfield, Manchester, Methuen, Newburyport, Peabody, Pigeoncove, and Rockport. Franklin County, Shelburne Falls and Warwick. Hampden County, Chester and Monson. Hampshire County, Chesterfield, Northampton, and Pelham. Lowell County, Westford. Middlesex County, Dunstable, Graniteville, Hopkinton, Medford, North Acton, North Chelmsford, Somerville, Waltham, Westford, West Townsend, and Winchester. Norfolk County, East Weymouth, Quincy, East Milton, Gass place, West Quincy, and Wrentham. Plymouth County, Hingham. Suffolk County, Franklin Park and West Re Worcester County, Dud

ley, Fitchburg, Leominster, Milford, North Milford, Northbridge, Oxford, Uxbridge, West Auburn, and Worcester. Principal quarrying centers are Becket, Milford, Quincy, and Rockport.

Graphite. Franklin County, impure bed about 5 feet wide reported at Charlemont. Worcester County, in gneiss at Sturbridge; has been mined. Grindstones (millstones). A slate suitable for grindstones found at Malden and Quincy in the Cambridge slate. Berkshire County, millstone produced at Washington.

Hematite. Franklin County, has been mined in small way at Bernardston, Montague, and Warwick. Hampshire County, at Hawley.

Infusorial earth. See Diatomaceous earth.

Iron. Jade.

See Brown iron ore, Chromite, Hematite, Magnetite, and Siderite. Middlesex County, has been obtained at Framingham; possibly williamsite and not true jade.

Jasper. Essex County, Saugus. Franklin County, in mica slate at Conway. Middlesex County, has been mined at Framingham.

Kaolin. See Clay (kaolin).

Lead. See Galena.

Lignite (brown coal). Dukes County, Marthas Vineyard, 50 tons mined in 1908, none since.

Limestone (building). Berkshire County, quarried at Dalton and North Adams. Middlesex County, has been quarried at Acton, Carlisle, Chelmsford, Littleton, and Stoneham. Worcester County, has been quarried at Bolton. Limestone (lime). Berkshire County, burned at Adams, Cheshire, and else

where.

Limonite. See Brown iron ore.

Magnetite (magnetic iron ore). Franklin County, considerable quantity of iron sand at Montague. Hampden County, large quantity impure at Warwick, considerable quantity has been mined at Sacket mine, Chester. Hampshire County, small bed at Plainfield.

Manganese. See Psilomelane, Pyrolusite, Rhodonite, and Wad.

Marble. Berkshire County, quarried at Alford, Ashley Falls, Lee, North, Adams, South Egremont, Stockbridge, West Stockbridge. Hampden County, Westfield.

Marl. Berkshire County, occurs at Lenox, Pittsfield, and Williamstown. mouth County, considerable quantity at Duxbury.

Ply

Mica (muscovite). Worcester County, at Beryl Hill, Royalston; has been prospected recently. Hampden County, occurs near Huntingdon. Hampshire County, occurs near Knightsville.

Mineral paints. Berkshire County, ocher and sienna were once worked at Williamstown. Franklin County, at East Whately.

Molybdenum. See Wulfenite.

Novaculite.

Peat.

Middlesex County, in beds of argillaceous slates at Malden. Norfolk County, Quincy. Suffolk County, Charlestown; not used. Numerous deposits in swamps and bogs principally in eastern and central parts of State. Peat fuel has been produced in small quantities at East Lexington, North Rynham, and at other points. There is a plant for producing peat for fertilizer at East Lexington.

Psilomelane. Franklin County, in quartz veins at Conway.

County, with slate near Plainfield; not mined.

Hampshire

Pyrite (iron pyrites). Franklin County, Davis mine near Rowe, cupriferous; shipping. Worcester County, mined for copperas at Hubbardston.

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