 | | Journal (article/letter/editorial) | | Introduction CHROMIUM DEPOSITS of Maryland and Eastern Pennsylvania WINSLOW H. H A R T F O R D Chemistry...Pennsylvania, gold from North Carolina, and chromium from Maryland and Pennslyvania. Because stainless steel and...technology came after the practical exhaustion o f the Maryland chromium ores, the mines are small and many have...the mines near Baltimore. History of Chromium and Chromium Chemicals in the Baltimore Area The story...yellow." 2 Opening at Choate mine, Soldiers Delight, Baltimore County, Maryland. Paul Clifford of Rocks and |  | | Report (issue) | | Deposits in Serpentine Rocks Of the Piedmont Upland Maryland, Pennsylvania And Delaware By NANCY C. PEARRE...deposits of chromite, titaniferous iron ore, rutile, talc, asbestos, magnesite, sodium-rich feldspar, corundum...districts ______ -._-_____-_____-___._. Montgomery County, Md_-_-_---_---_-_-----------_-__--_-_-_Soldiers...____________ Mine descriptions_______________________________________ Montgomery County, Md___-_______________________...and Harris mines..-_---_-_-_--__-_______. Choate mine._________________________________ Unnamed mine__ |  | | Report (issue) | | ^ Anne Arundel County 43 Baltimore County 45 Howard County - Montgomery County 88 Prince Georges...Georges County Virginia 74 . 120 129 Arlington County 129 Fairfax County 131 Fauquier County 139...139 Loudoun County 143 Prince William County 149 Diabase quarries of northern Virginia 155 CAPTIONS...Rhythmically.layered gabbro of the Baltimore Gabbro Complex at Ilchester, Maryland. Figure 6. Triassic diabase...of Anne Arundel, Prince George's/and Baltimore Counties, Maryland (Sterrett, 1911). Figure 9. Distribution |  | | Journal (article/letter/editorial) | | Department of Geology, University of Maryland, College Park, Maryland, 20742 JOHN KARL BÖHLKE, U.S. Geological...Department of Geology, University of Maryland, College Park, Maryland, 20742 Abstract Osmium isotope compositions... 1895; Coveney, 1981; Böhlke and Kistler, 1986; Weir and Kerrick, 1987; Böhlke, 1988, 1989), but the...to by dominant distinctive mineralogy as talc-carbonate, talc-carbonatequartz, and carbonate-quartz-mica...respectively (Coveney, 1981; Böhlke and Kistler, 1986; Weir and Kerrick, 1987; Böhlke, 1989). The fluids responsible |  | | Journal (article/letter/editorial) | | Tuolumne and Mariposa Counties, California R. H. WEIR, JR.,* ANDD. M. KERRICK Departmentof Geosciences...Mother Lode, these fluids altered ser- pentiniteto a talc-chlorite-magnesite-quartz assemblage whichiscrosscut...LODE GOLD MINES, CA 329 MOUNTAIN KINGROYAL MINE ALPINE MINE:.'.' _.',:, :/:• METASEDIMENTS •[] METAVOLCANICS...'.'...'.'.'.'.:COLORADO' -'...'.,QUARTZ. ' ..: .MINE,.' FIG. 1. Generalized geologicmapof the studyarea...relationships of the lithologies between 330 R. H. WEIR,JR.,AND D. M. KERRICK regionallymetamorphosed lithologies |  | | Report (issue) | | of the Grass Valley-Nevada City district, Nevada County, are about 30 miles north of the Mother Lode. At...River, Yuba County, and the Folsom district on the American River flood plain in Sacramento County. SELECTED...Stop 3 Josephine and Pine Tree mine Oro Rico mine; talk by Robert Weir Stop 4 Allochthonous limestone...Sonora, California Third Day Stop 6* Carson Hill mine Stop 7 Mountain King-Royal property Stop 8 Stop...Springs Formations Stop 10 Jackson overlook; Argonaut mine; talk by John E. Zimmerman Overnight stop, Jackson |  | | Journal (article/letter/editorial) | | University, Baltimore, MD 2 1218, USA *US Geological Survey, National Center, Reston, VA 22092, USA (Received...DENBURGH, 1975; DEIKE and JONES, 1980; JONES and WEIR, 1983) used bulk techniques such as X-ray diffraction...Wisconsin-Madison, 12 15 W Dayton St., Madison, WI 53706, USA. ’ Author to whom correspondence should be addressed...simplified geological map modified after JONESand WEIR ( 1983) showing sample sites. Lithologies are (...reviewed by DEIKEand JONES ( 1980) and JONES and WEIR ( 1983). The area is underlain and surrounded entirely |  | Lyttle, Peter T., Aleinikoff, John N., Burton, William C., Crider, E. Allen, Drake, Avery A., Froelich, Albert J., Horton, J. Wright, Kasselas, Gregorios, Mixon, Robert B., McCartan, Lucy, Nelson, Arthur E., Newell, Wayne L., Pavlides, Louis, Powars, David S., Southworth, C. Scott, Weems, Robert E. (2017) Geologic map of the Washington West 30’ × 60’ quadrangle, Maryland, Virginia, and Washington D.C. Open-File Report 2017-1142. US Geological Survey doi:10.3133/ofr20171142 | Report (issue) | | 472±4 Ma 478±6 Ma Oo* Early Ordovician 483±9 Ma Mine Run Complex Oi O|po O|mIV O|mIII O|gu O|mII...a maximum elevation of about 55 m (180 ft) in Maryland and 117 m (384 ft) in the District of Columbia...26. Lee (1980); Kasselas (1993) 27. Lee (1980); Weir (1977); R.E. Weems (unpub. data) 28. Lee (1980)...northern part of the Culpeper basin, Virginia and Maryland: U.S. Geological Survey Open-File Report 79–1557...of the Maestrichtian–Danian section in southern Maryland, in Frederiksen, N.O., and Krafft, Kathleen, eds |  | | Journal (article/letter/editorial) | | layer charges(e.g.,kaolinite, pyrophyllite, and talc) have small but finite exchangecapacitiesapparently...8) lllite/smectite 9) Muscovite Trioctahedral 10) Talc 11) Hectorite 12) Saponite 13) Synthetic F-rich...Washington County, Georgia, USA Unknown Crook County, Wyoming, USA GonzalesCounty, Texas, USA Amargosa...Amargosa desert, California,USA Otay, California,USA Black Jack Mine, ldaho, USA NA Synthetic Mo+o,.(Al3 roTio@F43... NA Hector, California.USA Ballarat, California,USA M965i6O,o(OH)4 Nao**Mgo,oSGirKJor.[(M95 31Lio6rXSi |  | | Journal (article/letter/editorial) | | begin to convert to talc after heating at 250ºC for 90 min. Total conversion to talc is observed at 550ºC...Complex, PVP, Serpentine, Supergene Alteration, Talc, XRD. INTRODUCTION Smectites form in a wide variety...components such as illite, kaolinite, chlorite, talc and serpentine (Eberl et al., 1982; Środoń and...associated with evaporites (Eberl et al., 1982; Jones and Weir, 1983; Bodine and Madsen, 1987). Fe-rich montmorillonites...profiles of ultrabasic rocks is disordered Ni-rich talc (pimelite according to Brindley and Maksimovic, |  | | Journal (article/letter/editorial) | | Kerolite is a trioctahedral phyllosilicate similar to talc in structure and composition, but it has a basal...be interstratified, possibly with non-expanding, talc-like layers. Mixed-layer kerolite/stevensite has...Amargosa Flat area include P-7 taken from an open pit mine labeled 7 in this figure, and D-2 and 12-14 takenfrom...that natural stevensite may be interstratified with talc-like layers, sets of computer-simulated XRD patterns...patterns of randomly interstratified, mixed-Iayer talc/smectite were calculated as a function of % expandable |  | | Journal (issue) | | (crude), kyanite. sand and gravel (industrial), sulfur,talc (soapstone), vermiculite-- NA Not available. XX...XX Not applicable. Production as measured by mine shipments, sales, or marketable production (including...Virginia in 1982. Riverton Corporation in Warren County produced masonry cement by calcining crushed limestone...portland cement. Lone Star Cement, Inc. in Botetourt County, produced portland cement from locally mined limestone...produced by Kyanite Mining Corporation in Buckingham County for use in the refractories and ceramic industries |  | | Journal (issue) | | CONTENTS HISTORIC MINERAL FEATURE The Mineralogy of Maryland: A Hiswrical Sketch by Jay L. Lininger HISTORIC...MINERAL FEATURE A History of Chromite and Copper in Maryland: The Tyson Years by Sally Newcomb HISTORIC MINERAL...the Copper Mine at Bare Hills, Maryland by Herbert C. Moore HISTORIC MINERAL FEATURE Maryland GOLD by Walter...MINERAL FEATURE William Keith's Copper Mine: Prelude to the Maryland-Pennsylvania Border War by Paul Chrastina...Lininger 125 HISTORICAL MINING CERTIFICATES The Maryland Gold Company by Walter A. Goetz 128 ON THE COVER |  | | Report (issue) | | Ground water in the Scotts Valley area, Santa Cruz County, California: 13 p., 4 figs. (Wa, Wb, LA, SF; 855...A., Geology and ground-water resources of Ocean County, New Jersey: 134 p., 30 figs. (Wa, Wb; 420 Federal... and Simmons, R. H., Floois of August 1967 in Maryland and Delaware: 223 p., 36 figs. (Wa, Wb; 724 York...area, Paradox district, Montrose County, Colorado, and San Juan County, Utah: 1 p., 5 pis. (Wa, Da, M;...surface movements in the Baldwin Hills, Los An?:eles County, California: 300 p., 50 figs. (Wa,. Da, M.) 37 |  | Auclair, Marie, Gauthier, Michel, Trottier, Jacques, Jebrak, Michel, Chartrand, Francis (1993) Mineralogy, geochemistry, and paragenesis of the Eastern Metals serpentinite-associated Ni-Cu-Zn deposit, Quebec Appalachians. Economic Geology, 88 (1) 123-138 doi:10.2113/gsecongeo.88.1.123 | Journal (article/letter/editorial) | | fiyschsequence allurgicalproblemscausedby the presenceof talc lien, 1987). Volcanicrocksnear the EasternMetals...serpentinitesliceassociated with the Eastern Regional-and mine-scalegeologicstudieswere carriedout by B•land (1957)...severaldiscontinuous lensesseparated from oneanotherby talc zones. Alteration Sequence Serpentiniteat the EasternMetals...EasternMetals depositis sequentially transformedinto talc-carbonateschist, ST. DANIEL MELANGE CALDWELL GROUP...andsd•c•hed ultramahc Sulhde-arsemde rocks deposit talc and limonite" (Rose, 1842, cited in Holmes, v Thrust |  | | Journal (article/letter/editorial) | | intimately with the disordered, hydrated variety of talc known as kerolite. Both minerals occur as pseudomorphs...re-examined and appears to be kerolite or ' hydrated -talc'. THE NATURE OF STEVENSITE AND KEROLITE Stevensite...described as 'talc pseudomorphous after pectolite' by Leeds (1873) from Hoboken, New Jersey, USA. The name...Stevensite continued to be regarded as a variety of talc until Faust & Murata (1953) showed it to be related...non-swelling layers which he described as saponite and talc. Faust et al. (1959) disagreed with Brindley's interpretation |  | | Journal (article/letter/editorial) | | charge Robbins, North Carolina Crook County, Wyoming Apache County, Arizona (Cheto) Otay, California Polkville...Polkville,Massachusetts GonzalesCounty, Texas BlackJack mine,ldaho Synthetic Synthetic Synthetic Dioctahedral...California Ballarat,California Synthetic Llano County, Texas New S Wales. Australia Trioctahedral MguSirO*(OH)o...lengths of 1.748 and Si-O bond lengths Pyrophyllite,talc, hectG sioolo 9.15. of 1.618 with hexagonalgeometry...octahedral sheetsin all 2:l layer silicates, including talc * Od*lfrom qsi, 31,) = 9.15 A + 0.74x. (Bailey, |  | | Book | | Illlnois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Michigan Minnesota Mississippi Missouri Montana...r~/ s,~vcv Maryland Dep2rl'lRE8'1,I: Oi Gsalo~, Mloei, The Johns Hopkins University Baltimore 18, Mary...northeast part of the Coosa Coal Field, St. Clair County, Alabama, by H. E. Rothrock. 1949. 69 B. 50 Well...and G. L. Richardson. 91 1940. district, Franklin County, Alabama, by E . F. Burchard and H. D. Pallister...C".1.5 Geology and mineral resources of Cherokee County, AlaC. 2 Abstract of Alabama clay bama, by E . |  | | Journal (article/letter/editorial) | | der Marel (1%9) to a I: Iregularly interstratified talc/saponite. Three occurrences have been reported:...interstratification of trioctahedral chlorite and talc. The mineral occurs as single crystals in a metamorphosed...NaAI is assumed to be in the talc component, similar to analyzed discrete talc in the same rock. The authors...chloritel talc 1: 1 interstratification also can be pictured as a 2: 1 regular alternation of talc and brucite...interstratification of trioctahedral chlorite and talc, but further documentation ofthe material's behavior |  | | Journal (article/letter/editorial) | | Survey. National Center Reston , Virginia 22092 H . WEIR ALAN Rothamsted ExpeIimental Station, Harpenden...sub-sampled Clays and Clay Min erals Jones and Weir 162 ,/' I ...... --·7C;:7. ')f'l'5 -4 , ,:...fractions. Clays and Clay Minerals Jones and Weir 164 17.2 I 3.37 I 13 .1 8.56 ~):: I (a)...(oKa Figure 6. Clays and Clay Minerals Jones and Weir 166 X-ray powder diffraction traces of aNa-saturated...for the trioctahedral silicates talc, saponite, and the hydrated talc mineral, kerolite, but not to trioctahedral |  | | Journal (article/letter/editorial) | | B/Shlkeand Kistler, 1986; Nesbitt et al., 1986; Weir alaskite(Streckeisen,!973; Table 1), with subequal...vein (Fig. lB) is one of severalsubThe Gold Crown mine (Fig. 1C) followsa single parallelandanastomosing...metamorphicbelt, California. B. The 1300 level of the Oriental mine on the Oriental vein. C. ThemainleveloftheGold...quartzveinswherethey cut metasedimentary rocks in the Gold Crown mine; however, disseminatedore- gradegoldoccurrences...commun., 1986). Past productionfrom the Gold Crown mine has come entirely from scatteredoccurrencesof native |  | | Journal (article/letter/editorial) | | 92093, USA *Department of Geology and Geophysics, University of California, Berkeley, CA 94720, USA f Received...Kaolinite 48.53 47.0’“‘” 45.8c”‘* 43.6Py’” 46.7ch” Talc 62.34 63.1c”‘Y 64.3py’o 66.5+’ 63.4py’0 a-.&h...to form another. - Paragonite Phlogopite; talc=Talc. V 40 4539 phfeg= Volume Caiculation of...diffraction ( ZVYAGIN and PINSKER, 1949a,b; ZVYAGIN, 1952; WEIR and GREEN-KELLEY, 1962; GAUDETTE, 1965; GUVEN, 1972;...related clay minerals. Micas and members of the talc-pyrophyllite group are less well suited for this |  | | Journal (article/letter/editorial) | | (U.S.S.R.). kaolinite-serpentine and pyrophyllite-talc groups. 0003-004x/80/0 I 02_000I $02.00 BAILEY:... Chrysotile, Pyrophyllite-talc xt0 Pyrophyllite Talc Pyrophyllite Talc Smectlte x I Dioctahedral...individual namesshould be the responsibility The terms "talc layer,' and ..brucite sheet" are not of the IMA...eral Names." chlorite structure,becausethe minerals talc and bru(4) "lt is recommendedthat X, y, Z, or [100]...recommendedthat 2: I layer be usedin place of ..talc axes." layef' and hydroxide sheetor interlayer sheet |  | | Report (volume) | | ............................................. Maryland.................................................Maryland____Prof. E. B. Mathews, Johns Hopkins University, Baltimore. Michigan____Mr. R. A. Smith, Lansing. Dr. A....See Bauxite and Halloysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found...commercial quantity or quality. Asphalt. Colbert County, small quantity has been shipped from near Leighton;...following localities : Bibb County, Pratts Ferry; Calhoun County, near Tampa; Clay County, T. 20 S., R. 7 E.; |  | | Report (volume) | | Geology. Chicago. Mammalogy-Journal of Mammalogy. Baltimore, Md. Marine Research-Journal of Marine Research...Bull.; County Rpt.-Maryland Department of Geology, Mines and Water Resources Bulletin; County Report...Report. Baltimore, Md. Maryland Naturalist--Maryland Naturalist. Baltimore, Md. Mazama-Mazama. Portland, Oregon...Boletin. Mexico City. Soil Sci.-Soil Science. Baltimore, Md. S. Dak. Geol. Survey Rpt. Inv.-South Dakota...resources of the valley-fill deposits of Allegheny County, Pennsylvania: Pa. Geol. Survey, 4th ser. Bull |
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