Mica
3 of the 7 encyclopedias on this shelf carry an entry for Mica. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
a name originally given to the shining, scaly constituent of many rocks A Eagle Har 88 MANITOU 1. B 87° C 86° D Eagle River Copper Falls Mines Phoenix Allouez Mohawk Calumet Places of 100,000 and over.. Detroit ay Demmon Learium Hancock 10,000 to 100,000 Jackson Lake Linden Houghton " Dollar Bay 5.000 to 10,000.- Holland 05 10 30 40 Baltio Portige L. Painesdale County Towns Pt. Abbaye Bay Railroads Chassell H Huron 10 20 30 40 50 60 70 80 Jacobsvill Keweenaw Bay 5 Skanee Big Bay Pt. LAKE SUPERIOR Baraga Pequaming Alston Bigbay L'Anse Vermilion Silver Herman O GRANITE 1. Birch BARAGA Lead Pt. Au Sable Granite Pt. Au Train, Munured Books Grand Marais Big Two Hearted Shelldrake Nestoria Marquette Grand Portal emewon Covington R Champion GRAND I R 2 Sidnaw Laughing Fish Pt. Michigamme/ R Negaunee Onota Train Humboldt Ishpeming Emerson CE B. T&qu Mangum Newberry Dollarvilles McMillano Laketon Eckerman Republic Sandso Talmar ALGER 7 Perch L MARQUETTE Wetmore Petrel Seney Chatham Witch Lake Princeton Paint Carlshend Limestone Soo Junction Amasa Germfask Beechwood Forsyth Helmer Winters SCHOOLCRAFT RO Manistique L. Curtis Donald Trout Lake Turin Mansfield Channing Ralph- Steuben Trenary- Caffey Iron River Blaney Gould City Garnet OL Orystal Falls Northland Sagola Uno Ozark Escu nistique Stambaugh Defiance M Hiawatha DICKINSON C 46 Pentoga Viola Naubinway Epoufette Perbine Huntspur Indian L Metropolitan Hardwood DELT Florence ◎ Menominee Foster Cy Simmons Gulliver Cooks Rapid River Labranche Manistique Pt. Paterson Iron Mountain. O Masonville CHARLEVOIX Thorapson Isabella Norway Whitney o Gladstone Big Bay P Nahma COUNTY -Loretto GARDEN I Schaffer Wells Straits Pt. Aux Barque Escanaba P Waucedah HOG I. Vans Harbor Hermansville Bark Garden de Noc St. James Stonington River Powers Harris TO Pembing Faithorn Ford River Favette HIGH I. Nadeau Gourley BEAVER I. Pike LIT.SUMMER IA Pt. Detour Laona Nathan Cross Village Bagley R. MENOMINEE FO SUMMER I. 3 Goodhart POVERTY I R. TO LEELANAR COUNTY ST.MARTIN I. Daggett NORTH FOX I. Stephenson N Harbor Sprs. Koss Cedar River Lit. Traverse Bay Ingalls Leelanau GREEN BİZAY WASHINGTON Grand Traverse Bayshore Detroit Har. Wallace Crivitz Poshtig Charlevoi Arthur Bay Bay CHARLEVOIX Menominee Ellsworth Ephraim A ✓ CHAMBER'S E. Jordan Northport R. N. Eastport Marinette NORTH MANITOU 1. Manitou I. Omena Central Lake 45 Suring Egg Labor Leland Torch Lake SOUTH MANITOU I ANTRIM Torchlight L R. R Gillett Suttons Ba Good Harbor Bellaire Alba Oconto O LEELANAU Elk Rapids Shawano Oconto Glen Arbord Cedar Tsadore R. Alden Sturgeon Bay Burdickville Shawano Rapid City Empires Maple Solon Acme Barker Leetsville C Wolf Cedar Rung Creek Edgewater Lake Anno Traverse City Kalkaška Pt. Z I Mayfield S. Boardman Algoma Frankfort BENZIE S Benzonia Wallin TRAVERSE 5 4 Kingsley Sharón Seymour Thompsonville Nessen Cy. Waltono Green Bay Arcadia Henry Copemish Kewaunee Morey R. Bear Lake Manton Bag Sherman Stittsville Appleton Fox Onekama Calef Kaleva Mesick MISSAUKEE Wrightstown WEXFORD Lake City Arend MANISTEE Brethren Harriette Cadillac Butterfield Manistee Boon Manistee R Menasha Lucas Dolph Eastlake Two Rivers Hilbert Hoxeyville Hobart Filer City Dublin MoBain C Suble R. Lake Tustin Dighton Parklake Big Freesoil Oshkosh Manitowoe Big Sable Pt Marion Chilton Fountain Millerton 44 Hartwick Luther Big Sable LA MA'S ON Peacock Le Roy Winnebago Ludington Scottsville LAKE COSCEOLACLARE Branch Nirvana Ashton Evart Lake Buttersville Custer Baldwin Reed City Sears Fern Carre M Chase Hersey Crooked Lake 1 Marlboro O Fond du Lac Sheboygan Pentwater Crystal Val.cy Lilley Parka Parit Barryton Walkerville, Chippewa Big Rapids Lake Weidmano Sherman Hart. Mears Houseman Rodney Woodville OCEANA Lit Sable Pt. MECOSTA M NEWAYGO Ferry Shelby stanwood Mecosta Remus 5 S Hesperia Whitecloud New Era Morley Millbrook Fremont Bigprairie Rothbury Blanchard, R West Bend Milwaukee Reeman Lakeview Sixlakes Montague Muskegon Port Washington Croton Jo White L. Whitehall Howard City Edmore Newaygo Coral Langston Michillinda MUSKEGO Bailey Twin Lake Bri Bridgeton MONTCALM Grant N.Muskegon Trufant Cedar Splant Gowen Stanton Muskegon Slocuni 10 Sheridan σ Greenville c Kent CityLincoln Lake Gree o Sussex o Fenwick Lake Harbor Sullivan Sparta Edgerton E L Conklin Ferrysburg Nunica (Coopersville Alpine forelding Rockford Shiloh Milwaukee Grand Haven Waukesha 43 Eastmany Heo Berlin KENT Orleans • Grand Lowell Grand O R. Allendale Agnew OTTAWA S.Milwaukee Eagle Rapids Portland Jenicon IONIA Hudsonville Dutton K McCords Holland Clarksville Byron Cen Lake Ottawa Beach Zeeland Ross Caledonia Racine Graafschapo Overisel Moline Freeport o Elkhorn Saugatuck alamaz Middleville O Dorr Hamilton Woodland Hastings • Hilliards Douglase Bradley Quimby New Richmond Kenosha ALLEGAN BARRY A Gangeso Fenuville 6 Allegan Martin Cloverdale Glenno Priman Otsego Doster Delton Assyria • Richmond Bravo Pullma Hickory Cors. Plain cell S. Havene Kibble Grand Ju. Alamo Richland Penfield Waukegan Augusta Battle Kalamazoo Bangor Woodstock 9 L Rondout Coverto VAN BUREN Paw Paw o Oshtemo Galesburg Lawrence ice KALAMAZOO CALHOUN Coloma Riverside Hartford Lawtono ton Mattawany Scotts L.Lefox Benton Harbor Watervliet Keeler Decatur Decatur Schoolcraft Vicksburg St. Joseph Athens 10 Des Plaines 42 Glenwood Marcellus Moorepark Mendon, Sodus Union Cy. Stevensville use ILLINOIS Sherwood Baroda, Berrien Sprs. Dowagiac Three Rivers Colono Cold water CASS Geneva Centerfme Bronson Chicago BERRIEN Corey O Lakeside Cassopolis ST.JOSEPH BRANCH 7 Wheaton Buchanan Niles Constantine White New Buffalo Kinderhook Three Oaks Edwardsburg Union o Sturgis Pigeon 88° B A 87° Longitude C West 86° from D Greenwich 85 Beacon Hill PIE 1. Blake Pt. Toivola Fourteen Mile Pt Saime scale as main map Elmriver Ontonagon LAKE Lone Rock inona Green Greenland Porcupine Mts Rockland Siskawit B. OnANGE Johns Presque Isle Bluff 89° Victoria Rubicon 8447 MINERAL E Korelock Ω Bruce Crossing Montreal Pancake Pt. Matchwood 10 Bessemer Ewen BATCHEWANA Iron wood Wakefield Gogebic L Trout Cri Kenton Hurley GOGEBIC Whitefish Pt. Robbins Dunham Marenisco RON Gogebic PARISIAN I WHITE FISH Watersmeet Mercer 2 St Marys R BAY Payment WISCONSIN State Line Strongs Bay Sault Ste. Marie Mills Rosedale 900 UGAR Brimley 89° CHIPPEWA 83° AF GA Kinross o NEEBISH Barbeau D Neebish Dick Dryburg Rudyard Tone 6 ST. JOSEPH I. North Channel AID I Strongville Pickford NORTH PASSAGE JOHN 1. O Raber 01 AC Rockview Maxton Kenneth 46 Drummond Hessel Gaterville Retour DRUMMOND 1/COCKBURN Allenville Cedarville Brtin BARRIE 1. MA NOI T 1. 1.MARQUETTE StIgnace Groscap Cape MACKINAC I. of Mackinac Bois Blanc NID. Mackinaw BOIS BLANC I. WESTERN DUCK TO MACKINAC COUNTY Carp Lake South Channel Bliss Weadock GREAT DUCK Cheboygan OUTER DUOK Mullet Lake Peliston o Alverno Grace EMMET Hammond 3 E Mullet L. Manning Forty Mile Pt. Brutus Burts L Oden Black D. Rogers CHEBOYGAN Allis Mimersburg Adams Pt. Indian River Bayview Tower Onaway Presque Isle Petoskey Rondo PRESQUE ISLE Walloon L. Wolverine HUR Metz Poseп Bell Trowbridge Long L. Boyne City Leer Boyne Falls Cornwell Long Rapids Bolton Valentine Hilman Flanders Vanderbilt pena MONTMORENCY Elmira Gaylord Hetherton Atlanta ALPENA 45 North Pt. O Dafoe OTSEGO, Big Rock O Thunder Bay Johannesburg Spratt Klein Ossineke • Wetzell Otsego Lake South Pt. Hubbard/Lake no Lewiston • Mancelona Waters Blackriver lo Deward Hubbard L. Spruce Hardgrove Comins ) 0 Frederic Judge R Redoak Biggs Hawes Curran Sturgeon Pt. CRAWFORD COSCODA Kinley Lincoln Harrisville ALCONA SpencerGrayling Sigsbee Killmaster Mio Wellington Eldorado Luzerne Glennie Greenbush Mikado 0 Fletcher σ Pere Cheney Curtisville Cedar L. Lott 4 O South branch Sable R: Moorestown Keno C Lupton Higgins L. Roscommon Ellake Oscoda Au Sable Rose City • Markey Hale Canfielda Houghton L. St. Helen IOSCO Point au Sable Siloam East Tawas ROSCOMMON OGEMAW Nestero Tawas Beach 01 Prudenville Emery Jo. Westbranch Whittemore Tawas City Loxley Nolan Prescotto Turtle Alabaster Edwardo Vogel Cen. Maple Turner Butman Alger Ridge Twining Leota Longlake Gravelly Pt. Pte. Aux Barques Burnt Cabin Pt. ARENAC Bockaday farion Harrison Grind Stone City Omer Port Austin Au Gres Temple Dodge GLADWIN Sterling 44 Gladwin Bentley, Standin Arena Pt. aux Gres Pinnebog Port Hope o Kinde Wheatley Georgeo Caseville Sand Pt Highwood Filion Mountforest Bay Port Hatton Beaverton. Harbor Farwell Pinconning SAGINAW HURON Beach Estey Lyle Clare Coleman Edenville BAY Pigeon Verona Mills Herrick BAY Bad Axe Oweudale • Hope Brinton Linwood Whiterock First Pt. Cy Rosebush MIDLAND Willard Otian Ubly Ruth At Bay City Sebewaing Minden City Gagetown Tyre Sanford test Midland e ISABELLA Essexville Unionville Cass Cy. Cumber Palins Olsono Mt. 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CLAIR 43 Ionia St.Johns Owosso Corunna 이 Emmett Capac Flint Ovid SHIAWASSEE Hunters Creek Port Huron Lyons Westphalia CLINTON Laings-Vernon Swartz Creek ab Almonto Columbus Goodrich Wacousta De Witt burg Durand Perry o Bancroft Gaines Leonard Armada- St. Clair Ortonville Oxford O Romeo Linden Orion Odessa Eagle Bath • Shaftsburg Holly Richmond Ada Davisburg Fenton New Haven Marine Or. LANSING Anchoryille OAKLAND Grand Woodbury Oak Grove Lar Powderville Pontiac Rochest MACOMB Williams Webberyille Alronac Ledge Vermontville Potterville ton Utica Mt.Cl Mt.Clemens Hartlando Highland EATON INGHAM Howell 7 St Milford Troy Mason LIVINGSTON Wizom Birmingham Warren Eden Charlotte G Roseville Dansville Plainfield Farmington Clawson 6 Eaton Rapidso Brighton Leslie Stockbridge LAKE ST.CLAIR S.Lyon Lakeland Béllevue Onondagao Northville Highland Park Grosse Pointe Farms Munith Whitmore Lake Springport Salem Plymouth Rives Jc Marshall JACKSON Ann Arbor Ypsilanti metros Wayne Delray Chelsea Dexter Creek WAYNE River Rouge WASHTENA W Romulus Wyandotte Jackson. Detroit Saline Whittaker Belleville CANADA Tekonsho Homer Concord Napoleon Manchester Trentou Waltzo Milano Hanovero Brooklyn Rock wood Leamington Carleton Clinton Cement Cy... Litchfield Tecumseh Azalia Maybee Newpoft 42 Onstedo Jerome o Britton Allen Jonesville LENAWEE MONROE Quincy Hillsdale LENA WEE Lenawee Jc Dundee Monroe LAKE ERIE Clayton Lulu HILLSDALE Audeo Adrian Salle 7 Erie Blissfield PTE.PELEE 1. Reading Seneca Montgomeryo Prattville Munson Jasper Temperance North N.BASS Morenci Camden Waldrou ° 84° E F 83° G Underwood & Underwood YOSEMITE FALLS IN THE YOSEMITE NATIONAL PARK, CALIFORNIA A GLACIER ON MT. RAINIER, MT. RAINIER NATIONAL PARK, STATE OF WASHINGTON Publishers' Photo Service CLIMBING THE BLACKFOOT GLACIER, IN GLACIER NATIONAL PARK, MONTANA Publishers' Photo Service CLIFF PALACE IN MESA VERDE NATIONAL PARK, SOUTHWESTERN COLORADO Newman Traveltalks & Brown & Dawson YELLOW AND WHITE CLIFFS IN THE GRAND CANON OF ARIZONA E. M. Newman THE GREAT RAINBOW BRIDGE, A NATURAL BRIDGE IN UTAH diversity of chemand other characters led Sion into several species, which supposed to have distinctive crystallographic and chemical characters. The word is now used to designate a group of minerals having certain charmost important acters in common, the the of which is the eminently perfect basal cleavage, which affords very thin, tough, and shining laminæ.
Aiton's Encyclopedia (1910)
mi'ka, a rock-forming mineral well known for its cleavage into thin, elastic laminae or layers. There are several varieties. The best known is a potash mica. It occurs in small gray flakes in granites and gneiss. Masses cleave into remarkably thin, tough plates, having a pearly or silvery surface and a glossy lustre. Mica is transparent and non-combustible. It is used as a substitute for glass and for a variety of purposes. Mica spectacles are used in machine shops to protect the eyes from flying particles that might crack glass. Mica plates are used in headlights and in the construction of lanterns and stoves. Mica is used for windows to such an extent in Russia or Muscovy that it is known to geologists as muscovite. It occurs colorless as well as tinged with brown, green, violet, pink, etc. Black mica owes its color to the presence of iron. Ground to a powder and mixed with varnish, mica makes a glittering ornamental decoration for expensive wall papers. Ground mica is used also as a lubricator for machinery, known in the trade as mica axle grease. Many rocks owe their cleavage to the presence of mica. The chief source of American mica is the village of Spruce Pine, North Carolina . The mineral occurs in veins in quartz rock. The mica is quarried with care in blocks. The blocks are split with a knife into thin sheets. The sheets are trimmed with shears into various sizes. The largest size known in the regular trade is eight by ten inches. There are 183 sizes and shapes. Mica is worthy from sixty cents to $13 a pound according to size and quality. An armful may be worth several hundred dollars. Scraps and defective blocks are ground into powder. For an account of a transparent substance of animal origin with which mica is popularly confounded, see ISINGLASS.
The Encyclopedia of Founding (1892)
A mineral of a somewhat metallic lustre, that will permit of being split in thin plates, which can be substituted for glass in ship's lanterns, etc.; also for mounting transparencies in stoves. It is a widely diffused and plentiful mineral, entering largely into the composition of granite, mica-slate, etc. It consists essentially of silicate of alumina, with which are combined small portions of silicates of potash, soda, oxide of iron, oxide of manganese, etc. See GRANITE.