 | | Report (issue) | | Pegmatite Investigations 1942-45 New England By EUGENE N. CAMERON and OTHERS GEOLOGICAL SURVEY PROFESSIONAL...______________________________________ _ Location of pegmatite districts ___________________ _ Previous work..._________ _ History of pegmatite mining inN ew England _______ _ Mica mining ______________________________..._______ _ Feldspar mining ___________________________ _ Mining methods ___________________________ _...deposits _______________________ _ Geology of the pegmatite districts of Maine __ :. . _____ _ Metamorphic |  | | Report (issue) | | Pegmatite Investigations 1942-1945 Black Hills, South Dakota By LINCOLN R. PAGE and OTHERS GEOLOGICAL...Descriptions, maps, and diagrams of deposits of mica, beryl, lithium, tantalum, tin, and feldspar UNITED...__ Tertiary dike rocks.______-_--_-______--____ Mica deposits._____________________________________ Distribution__...________ Composition and physical properties of mica. _______ Composition _______________________________..._______________________ Mining, preparation, and uses of mica. _____________ Mining.___________________________________ |  | | Report (issue) | | many sections of the work and made most of the crystal drawings. For a portion of their time on this project...Helpful suggestions on field occurrences and pegmatite mineralogy were received horn Dr. James J. Norton...Professor Edwin H . Oshier, Head of the Department of Mining Engineering, made the photographs included in this...(Nb) instead of columbium (Cb). CRYSTALLOGRAPHIC Crystal Class Symbols i, 2/m, m3m etc. • Miller Indices...010, 110, hkl, etc. • Identification of Faces on crystal drawings • • Face or Form Symbol a b C !l d |  | | Report (issue) | | therewith. 1 U.S. Geological Survey Denver, Colorado 9 ^University of South Dakota Vermillion, South...of the U.S. Geological Survey library, Denver, Colorado, were of great help in compiling and checking...Report 21, 10 p. Aase, J.H., 1977, South Dakota, in Mining and mineral operations in the north-central states;...thesis. Ackerman, Walter, 1953, Louis Beryl Pegmatite, Custer County, South Dakota: Rapid City, South Dakota...Ackerman, W.C., 1952, Peerless Pegmatite, Keystone, Pennington County, South Dakota: Rapid City, South |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state...included contain such specific details as farm roads, mountain paths, stretches of stream beds, and easily identifiable... test samples in the field for/ hardness, crystal formation," (continued on back flap) r 1° *o...Quartz crystal 'y^ Garnet — Azu rite, Malachite, Chrysocolla, Turquoise LJ Emerald, Beryl *"» Agate...Maryland; Professor Richard Pearl of Colorado Springs, Colorado; and Professor Jack Hanahan of Belmont |  | | Book | | HfiRIN COUNTY FREE LIBRfiRY 311110G386652Q I V Russell P MacFal A COLOR TREASUF FOR COLLECTORS...gems and the science of crystallography— the six crystal systems and their characteristics. The actual tests...to Hunting Locations ? i 9 GIVEN TO THE MARIN COUNTY LIBRARY BY MARI N L MTNF.RAT. SOCTETY DAVID...Formations Compact and Special Forms Druses and Crystal Amorphous Forms VII 4 PHASES OF ROCK COLLECTING...SYMMETRY OF CRYSTALS Nature of a Crystal tems 16 I The Six Crystal Systems I Characteristic of the | | | Book | | and the science o f crystall ography- the six crystal systems and thei r characteristics. The actual...Format,ons Compact and Special Forms Druses and Crystal Amorphous Forms VII PHASES OF ROCK COLLECTING...SYMMETRY OF CRYSTALS 88 Nature of a Crystal I Th e Six Crystal Systems I Characteristic of the Systems...These are needed to spltt layers of rock remove crystal cavities from cliffs and tnm specimens to the desired...Center Geological Survey Federal Center Denver Colorado 80225 Index sheets from wh ich the precise maps |
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