 | | Report (issue) | | DESCRIPTIVE MINERALOGY OF PENNSYLVANIA 104 Na 2Al 2 Si3 Oi .2H 2 O; SiO 2 47.4, A1 2 O 3 26.8, Na...Na 2 O 16.3, Lenni, Delaware County. Crystals. Eyerman, 1911, 11. Composition: Analysis: Fe 2 O3 CaO...LOCALITIES: Berks County: Birdsboro, and Gickerville; Delaware County: Leiperville, Lenni (druses of colorless...quarry; Montgomery County: Sumneytown, and Perkiomenville ; Philadelphia: Fairmount Park, Frankford, and...cut east of Reading (probably Birdsboro), Berks County. White, Smith, 1910, 540. silky mass of radiating |  | | Report (volume) | | Gem Stones of the United States GEOLOGICAL SURVEY BULLETIN 1042-G A CONTRIBUTION TO ECONOMIC GEOLOGY...GEOLOGY GEM STONES OF THE UNITED STATES By Dorothy M. Schlegel ABSTRACT Many semiprecious, but few precious...durability, and rarity are the most important qualities of a precious gem. Gem stones are distinguished by their...parting, hardness, specific gravity, luster, index of refraction, transparency, and dispersion. Gems are...carat, one-fifth of a gram or 200 milligrams, is the unit of weight measurement. The color of four popular |  | | Book (volume) | | corner of Kimball Co. where it overlooks both Colorado and Wyoming. The subsurface rock strata of the entire...Mountains as they rose during the Larimide revolution of 100 million years ago that closed the Mesozoic era...west reaches rise to the high, arid sagebrush plains of eastern Wyoming, disclosing spectacular bedrock formations...Nebraska contains most of the gem fields in the state, insomuch as both the Black Hills of South Dakota and...scenic Badlands thrust long spurs into this part of the state. In this rough, uncurried region are found |  | | Book (volume) | | sea which received successively enormous quantities of Ordovician, Silurian, Devonian, Mississippian and...and Pennsylvanian sediments; the erosional products of some 200 million years. Few, if any Mesozoic rocks...rocks appear within the state, but every one of Ohio’s 88 counties is surfaced with Pleistocene debris....produces pieces of silicified wood. Ohio ranks first in the nation in the production of limestone and dolomite...dolomite, and second in the production of clays. Lesser production of iron, petroleum, natural gas and coal |  | | Book (volume) | | sea which received successively enormous quantities of Ordovician, Silurian, Devonian, Mississippian and...and Pennsylvanian sediments; the erosional products of some 200 million years. Few, if any Mesozoic rocks...rocks appear within the state, but every one of Ohio’s 88 counties is surfaced with Pleistocene debris....produces pieces of silicified wood. Ohio ranks first in the nation in the production of limestone and dolomite...dolomite, and second in the production of clays. Lesser production of iron, petroleum, natural gas and coal |  | | Report (volume) | | DEPARTMENT OF THE INTERIOR FRANKLIN K. LANE, Secretary UNITED STATES GEOLOGICAL SURVEY GEORGE OTIS SMITH...SMITH, Director Bulletin 624 USEFUL MINERALS OF THE UNITED STATES**-^ COMPILED BY FRANK C. SCHRADER...SCHRADER, RALPH W. STONE AND SAMUEL SANFORD A revision of Bulletin 585 WASHINGTON GOVERNMENT FEINTING OFFICE.................................... 102 District of Columbia ..................................................................................... Pennsylvania............................................ |  | | Report (volume) | | DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY GEORGE OTI8 SMITH, DIRECTOR BULLETIN 585...585 USEFUL MINERALS OF THE UNITED STATES COMPILED BY SAMUEL SANFORD AND RALPH W. STONE WASHINGTON...GOVERNMENT PRINTING OFFICE 1914 USEFUL MINERALS OF THE UNITED STATES. Compiled by SAMUEL SANFORD and...EDWARD W. PARKEH. The final chapters of two of the earlier volumes of the Geological Survey's annual report...Mineral Resources of the United States" (the volumes for 1882 and 1887) consist of lists of the useful minerals |  | | Book | | Indeed it to is, and author book Jay in this of popular the Ellis Ransom, Rock-huntefs Range...everything you need to know to go about it. Some of the best prospecting, he points out, is in abandoned...commercial ores and secondary minerals by state, county, township, and geologic range. For easy identification...comprehensive, alphabetical listing of 400 mineral species and an outline of the essential chemical and physical...physical characteristics of each, as well as a dis- cussion of the basic kinds of rock: igneous, sedimentary |
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