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The Rutile Deposits of the Eastern United States
THE RUTILE DEPOSITS OF THE EASTERN UNITED STATES. By THOMAS L. WATSON. INTRODUCTION. The titanium-bearing minerals comprise more than 60 distinct species, grouped under a variety of mineral and chemical forms, chiefly as oxides, titanates, titano-silicates, silicates, columbates, and iantalates. These minerals are widely distributed in a variety of associations and in such quantity as to make titanium a relatively abundant element. Clarke* estimates the. amount of titanium in the solid crust of the earth to be 0.44 per cent, equivalent in oxide to 0.73 per cent, the element thus standing in the ninth place in the scale of abundance, next to potassium. Most of the titanium-bearing minerals, however, are rare and are only of scientific interest. The largest concentrations of the element are as oxide (rutile), as iron titanate (ilmenite), and in iron ferrate (magnetite) as intergrown ilmenite. Of these three forms the prin cipal source of the element at present is rutile. The known workable deposits of rutile, however, are extremely few and widely sepa rated, and as the demand for titanium has greatly increased in the last few years it has been necessary for some uses to turn to ilmenite or highly titaniferous magnetites. This paper briefly summarizes present knowledge of the geology of the rutile deposits in the eastern United States and for the sake of comparison discusses several foreign deposits, each of which has produced some rutile. Of the known deposits in the United, States only those in Virginia are of commercial importance. These have been made the subject of a special report 2 by the Virginia Geological Survey, which was preceded by a preliminary paper on the rutile deposits of Amherst and Nelson counties.3 1 Clarke, F. -
Mineral Collecting Sites in North Carolina by W
.'.' .., Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie RUTILE GUMMITE IN GARNET RUBY CORUNDUM GOLD TORBERNITE GARNET IN MICA ANATASE RUTILE AJTUNITE AND TORBERNITE THULITE AND PYRITE MONAZITE EMERALD CUPRITE SMOKY QUARTZ ZIRCON TORBERNITE ~/ UBRAR'l USE ONLV ,~O NOT REMOVE. fROM LIBRARY N. C. GEOLOGICAL SUHVEY Information Circular 24 Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie Raleigh 1978 Second Printing 1980. Additional copies of this publication may be obtained from: North CarOlina Department of Natural Resources and Community Development Geological Survey Section P. O. Box 27687 ~ Raleigh. N. C. 27611 1823 --~- GEOLOGICAL SURVEY SECTION The Geological Survey Section shall, by law"...make such exami nation, survey, and mapping of the geology, mineralogy, and topo graphy of the state, including their industrial and economic utilization as it may consider necessary." In carrying out its duties under this law, the section promotes the wise conservation and use of mineral resources by industry, commerce, agriculture, and other governmental agencies for the general welfare of the citizens of North Carolina. The Section conducts a number of basic and applied research projects in environmental resource planning, mineral resource explora tion, mineral statistics, and systematic geologic mapping. Services constitute a major portion ofthe Sections's activities and include identi fying rock and mineral samples submitted by the citizens of the state and providing consulting services and specially prepared reports to other agencies that require geological information. The Geological Survey Section publishes results of research in a series of Bulletins, Economic Papers, Information Circulars, Educa tional Series, Geologic Maps, and Special Publications. -
The Seven Crystal Systems
Learning Series: Basic Rockhound Knowledge The Seven Crystal Systems The seven crystal systems are a method of classifying crystals according to their atomic lattice or structure. The atomic lattice is a three dimensional network of atoms that are arranged in a symmetrical pattern. The shape of the lattice determines not only which crystal system the stone belongs to, but all of its physical properties and appearance. In some crystal healing practices the axial symmetry of a crystal is believed to directly influence its metaphysical properties. For example crystals in the Cubic System are believed to be grounding, because the cube is a symbol of the element Earth. There are seven crystal systems or groups, each of which has a distinct atomic lattice. Here we have outlined the basic atomic structure of the seven systems, along with some common examples of each system. Cubic System Also known as the isometric system. All three axes are of equal length and intersect at right angles. Based on a square inner structure. Crystal shapes include: Cube (diamond, fluorite, pyrite) Octahedron (diamond, fluorite, magnetite) Rhombic dodecahedron (garnet, lapis lazuli rarely crystallises) Icosi-tetrahedron (pyrite, sphalerite) Hexacisochedron (pyrite) Common Cubic Crystals: Diamond Fluorite Garnet Spinel Gold Pyrite Silver Tetragonal System Two axes are of equal length and are in the same plane, the main axis is either longer or shorter, and all three intersect at right angles. Based on a rectangular inner structure. Crystal shapes include: Four-sided prisms and pyramids Trapezohedrons Eight-sided and double pyramids Icosi-tetrahedron (pyrite, sphalerite) Hexacisochedron (pyrite) Common Tetragonal Crystals: Anatase Apophyllite Chalcopyrite Rutile Scapolite Scheelite Wulfenite Zircon Hexagonal System Three out of the four axes are in one plane, of the same length, and intersect each other at angles of 60 degrees. -
Scandium Mineralization Associated with Hydrothermal Lazulite-Quartz Veins in the Lower Austroalpine Grobgneis Complex, Eastern Alps, Austria
Bernhard, F. (2001): Scandium mineralization associated with hydrothermal lazulite-quartz veins in the Lower Austroalpine Grobgneis complex, Eastern Alps, Austria. In: Piestrzynski A. et al. (eds.): Mineral Deposits at the Beginning of the 21st Century. Proceedings of the joint sixth biennial SGA-SEG meeting. Kraków, Poland. A.A.Balkema Publishers, 935-938. Scandium mineralization associated with hydrothermal lazulite-quartz veins in the Lower Austroalpine Grobgneis complex, Eastern Alps, Austria F. Bernhard Institut für Technische Geologie und Angewandte Mineralogie, Technische Universität Graz, Rechbauerstraße 12, A-8010 Graz, Austria ABSTRACT: Lazulite (MgAl2(PO4)2(OH)2)-quartz veins within the Lower Austroalpine Grobgneis complex, Austria, have Sc-contents up to 200 ppm. The predominant Sc-carrier is pretulite, ScPO4, and this phase oc- curs as a wide-spread accessory mineral. Vein formation took place at temperatures of 300-500° C and low pressure during Permo-Triassic extensional tectonics and fluid flow. Mg-enriched alteration zones suggest that vein material was not derived from the immediate host rocks. Eo-Alpine metamorphism and deformation overprinted the veins to varying degrees. Despite the low tonnage of the Sc-rich veins, this new type of Sc- mineralization may point to larger Sc-accumulations in similar phosphate-rich hydrothermal environments. 1 INTRODUCTION The long-known lazulite (MgAl2(PO4)2(OH)2)- quartz veins in northeastern Styria and southern Scandium is a moderately abundant transition ele- Lower Austria contain significant Sc-enrichments in ment with an average content ca. 7 ppm in the upper the form of pretulite, ScPO4 (Bernhard et al. 1998b). and ca. 25 ppm in the lower continental crust (We- This contribution gives data on the geology, miner- depohl 1995). -
Compositional Asymmetry in Replacement Tourmaline – an Example from the Tauern Window, Eastern Alps
Geological Volume 4 Number 2 Mater ials August 12, 2002 Researc h Compositional asymmetry in replacement tourmaline – An example from the Tauern Window, Eastern Alps Darrell J. Henry1, Barbara L. Dutrow2 and Jane Selverstone3 1, 2Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70808, USA 1<[email protected]>, 2<[email protected]>, 3Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA 3<[email protected] > Abstract Tourmaline, partially replacing pre-existing tourmaline from a tectonically-dismembered tourmalinite vein, has developed distinctive compositional asymmetry that reflects influx of reac- tive fluids. The tourmalinite clast, enclosed in a quartzite from the Tauern Window, Eastern Alps, experienced a clockwise P-T-t path with maximal burial depths of 35-40 km (10-11 kbar), peak temperatures of ~550°C and major deformation preceding peak thermal conditions. The primary tourmaline of the tourmalinite clast, generation-1, is texturally and compositionally heterogeneous, ranging from schorl to dravite [Mg / (Mg + Fe) = 0.27 - 0.61] with highly-variable Al consistent X X with combinations of the Al(NaR)-1 and AlO(R(OH))-1 exchange vectors, where represents X-site vacancy and R is Fe2+ + Mn + Mg. Generation-2 tourmaline is manifest as distinctive compo- sitionally-asymmetric bands of colorless foitite (zone 1) and blue schorl (zone 2) replacing genera- tion-1 tourmaline. Replacement takes place along a scalloped margin and advances preferentially towards the analogous pole (-c) of generation-1 tourmaline. The two zones of generation-2 range from foitite to schorl with a restricted ratio of Mg / (Mg + Fe) of 0.32 - 0.41, but with variable X, X Al, Na and R predominantly reflecting Al(NaR)-1. -
'Uravesmountain Artd-·
/' ;~~ . - . :-.--... -~~;~-'. ' ) ;;. :,~~., . -'uravesMountain artd-· . ',MagrudetMine·, " . WiIkes_ Lmeolll~Gee"'.- .··~-SOUth~(JeolegicalSoc~~ OOidebOOk;NWIlber~3B- - April- 23-25, 1999 -. GRAVES MOUNTAIN AND MAGRUDER MINE Compiled and Edited by: Marc V. Hurst and Cornelis Winkler III - GUIDEBOOK NtTMBER 38 Prepared for the Annual Field Trip of the Southeastern Geological Society April 23-25, 1999 Published by the Southeastern Geological Society P.O. Box 1634 Tallahassee, Florida 32302 TABLE OF CONTENTS LOCATIONS OF GRAVES MOUNTAIN AND MAGRUDERMINE...................................... 1 INTRODUCTION TO GRAVES MOUNTAIN by John S. Whatley, JM. Huber Corporation.................................................................3 PHOSPHATE MINERALS OF GRAVES MOUNTAIN, GEORGIA by Henry BatWood............. .............................................................................................5 GRAVES MOUNTAIN, SLATE BELT, GEORGIA GEOLOGY by Gilles O. Allard, University of Georgia.................................................................... 11 GEOLOGY AND ECONOMIC POTENTIAL OF THE MAGRUDER MINE AND VICINITY by Norman L. Bryan ..................................................................................................... 17 \ \ \ \ \ \ \ \ \ \ Magruder Mme ~\ \ ,\(". ~\1- "'..,.. \9 \'> <'\'ci0;: \ I I I I l-s £-''d C!.'s., "I~ ~ \«\ (>\~ o I' I \ i-20 \ \ I \ \ I \ \ \ \ ~ \ '\ '\ '\ LOCATIONS OF GRAVES MOUNTAIN AND MAGRUDER MINE 2 J 5 ! ! I Scole in Hites Ap,.it 15. 1'J'J'J INTRODUCTION TO GRAVES MOUNTAIN by John S. -
GEMSTONES by Donald W
GEMSTONES By Donald W. Olson Domestic survey data and tables were prepared by Christine K. Pisut, statistical assistant, and the world production table was prepared by Glenn J. Wallace, international data coordinator. Gemstones have fascinated humans since prehistoric times. sustaining economically viable deposits (U.S. International They have been valued as treasured objects throughout history Trade Commission, 1997, p. 23). by all societies in all parts of the world. The first stones known The total value of natural gemstones produced in the United to have been used for making jewelry include amber, amethyst, States during 2001 was estimated to be at least $15.1 million coral, diamond, emerald, garnet, jade, jasper, lapis lazuli, pearl, (table 3). The production value was 12% less than the rock crystal, ruby, serpentine, and turquoise. These stones preceding year. The production decrease was mostly because served as status symbols for the wealthy. Today, gems are not the 2001 shell harvest was 13% less than in 2000. worn to demonstrate wealth as much as they are for pleasure or The estimate of 2001 U.S. gemstone production was based on in appreciation of their beauty (Schumann, 1998, p. 8). In this a survey of more than 200 domestic gemstone producers report, the terms “gem” and “gemstone” mean any mineral or conducted by the USGS. The survey provided a foundation for organic material (such as amber, pearl, and petrified wood) projecting the scope and level of domestic gemstone production used for personal adornment, display, or object of art because it during the year. However, the USGS survey did not represent possesses beauty, durability, and rarity. -
Lapis Lazuli
LAPIS LAZULI Among the world’s many gemstones, lapis lazuli, or “lapis” as it is familiarly known, has a distinction. Many scholars and archaeologists believe that it was the first gemstone ever mined in quantity. The oldest known lapis deposits, located in Afghanistan, have been systematically mined since about 4000 B.C. Few gemstones display color as rich as the deep, royal blue of fine lapis. Adding to its visual appeal, lapis often exhibits glittering, golden flecks of pyrite. When cut and polished into cabochons and set in gold, lapis gemstones have a distinctive beauty all their own. Understanding lapis lazuli, which is a rock, requires a basic understanding of lazurite, which is a mineral. Lazurite is the primary component of lapis lazuli and is also the cause of its blue color. Lazurite, or basic sodium calcium aluminum sulfate chlorosilicate (Na,Ca)8Si6Al6O24[(SO4),S,Cl,(OH)]2, is a tectosilicate or framework silicate that is made up of 13.5 percent sodium, 7.8 percent calcium, 15.8 percent aluminum, 16.3 percent silicon, 6.0 percent sulfur, 38.1 percent oxygen, and small percentages of chlorine and hydrogen. The color of pure lazurite is a deep azure. It crystallizes in the isometric (cubic) system, usually as dodecahedral and occasionally as cubic crystals, but most often occurs in massive form. Lazurite is usually opaque, has a dull-to-greasy luster, poor cleavage in six directions, a pale-blue streak, a Mohs hardness of 5.0-5.5, and a specific gravity of 2.4-2.5. Lazurite forms from high-grade, contact metamorphism of silica-poor marine limestone that contains available sulfur and chlorine. -
C:\Documents and Settings\Alan Smithee\My Documents\MOTM\Lazurite.Wpd
Cdbdladq1//8Lhmdq`knesgdLnmsg9K`ytqhsd From one of the world’s oldest mines in one of the world’s most remote and dangerous localities comes one of the best loved gemstone minerals, straight to your door! Our write-up explains the relationship of lazurite and lapis lazuli, Afghanistan’s legacy of lapis, and the fascinating history of its ancient mines. OVERVIEW PHYSICAL PROPERTIES Chemistry: (Na,Ca)8Si6Al6O24[(SO4),S,Cl,(OH)]2 Basic Sodium Calcium Aluminum Sulfate Chlorosilicate (Sodium Calcium Sulfate Chloroaluminosilicate Hydroxide) Class: Silicates Subclass: Tectosilicates Group: Sodalite Crystal System: Isometric (Cubic) Crystal Habit: Usually dodecahedral, occasionally cubic; most often in granular, compact, or massive form. Color: Azure-blue to violet-blue, occasionally greenish-blue. Luster: Dull to greasy Transparency: Usually opaque; occasionally translucent. Streak: Pale blue Refractive Index: 1.502-1.522 Cleavage: Poor in six directions Fracture: Uneven, brittle Hardness: 5.0-5.5 Specific Gravity: 2.4-2.5 Luminescence: None Distinctive Features and Tests: Best field marks are deep-blue color and association with pyrite [iron disulfide, FeS2]. Can be confused visually with sodalite [sodium aluminum chlorosilicate, Na8Al6Si6O24Cl2], which has coarser grain and paler color, and lazulite [basic magnesium aluminum phosphate, MgAl2(PO4)2(OH)2], which is softer and more dense. Dana Classification Number: 76.2.3.4.1 NAME The name “lazurite,” pronounced LAH-zhur-ite, stems from the Arabic lazaward, variously meaning “sky,” “heaven,” or “azure,” in reference to the mineral’s blue color. Lazurite has also been known as “cyaneus,” “ultramarine,” “lasurite,” “Lasurstein,” “lapis lazuli,” “lapis stone,” “sapphis,” and “sapphirus.” In European mineralogical literature, lazurite appears as lazurit and lazurita. -
E. M. Barron Exhibit of Minerals and Gem Collections
E. M. Barron Exhibit of Minerals and Gem Collections Join us for a virtual tour of these rare and beautiful specimens Colonel E. M. Barron Colonel E. M. Barron (1903-1969) of El Paso, Texas, one time State legislator and military man, turned his attention to minerals in later life, founding the Southern Gem Mining Company in the late 1940s. Opportunities to acquire rare and beautiful minerals were abundant. Mexico was close by and over the years Barron built a remarkable personal collection of rare specimens from Mexico. Barron bequeathed most of his collection to The University of Texas at Austin. Mineral localities Barron’s interests focused early on Mexico but expanded to classic localities around the world. Each red dot represents a locality from which one, or more, of his minerals were extracted. The Exhibit Minerals are naturally occurring, inorganic solids with definite chemical compositions and definite atomic structures (they are crystalline). Halite (salt) Chemical composition is the basis for grouping the exhibited minerals. Each display case is arranged by chemical class; carbonates, silicates etc. Exhibit Display Cases • 1. Introductory panel • 7, 8. Gems • 2. Silicates – 7. Gems and gemstones • 3. Native elements – 8. Cut and color • 4. Amethyst geode • 9. Topaz • 5. Carbonates and • 10. Agates phosphates [ includes arsenates, vanadates and • Numbers are located on the phosphates] exhibit map (next slide) • 6. Tungsten and molybdates [focus- wulfenite] Exhibit Map 3 1 GG1 More information about G2 the specimens More about -
What Are Minerals
What are Minerals How important are minerals to you? Minerals are very important, actually. Almost everything you own and use was manufacture using as least some minerals. You own or encounter many things made from minerals every day. Ceramic, metallic, and even some paper items are examples of products that are derived from or include minerals. Metal lockers, bookshelves, electronic devices, silverware, plate ware, pencils, cars, machines, sidewalks, paints, musical and precision instruments, materials to construct your home and the glass in windows are all comprised entirely of or at least some minerals. Minerals come from the ground, the rock or earth we walk on. The bike, the building, the bike rake and the color Azurite mineral with a blue copper element used in their clothes and backpacks contain minerals. for pigment dye and jewelry. Definition of a Mineral A mineral is a naturally occurring, inorganic solid with a definite chemical composition and an orderly geometric arrangement of atoms. About 4,000 different minerals are found on Earth, and they all share these four characteristics. Naturally occurring means minerals are found and made in nature, not laboratories. Inorganic means minerals are not alive like a bacteria or frog; they are non-living, not- organic. Inorganic also means minerals are not based on carbon, like living things. Chemical composition means certain atoms combine to form minerals and each of the 4,000 minerals has its own chemical composition. NaCl is the chemical composition of the mineral salt. Orderly geometric arrangement of atoms means atoms form a geometric structure on the atomic level. -
Vibrational Spectroscopy of the Phosphate Mineral Lazulite €“ (Mg
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 107 (2013) 241–247 Contents lists available at SciVerse ScienceDirect Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy journal homepage: www.elsevier.com/locate/saa Vibrational spectroscopy of the phosphate mineral lazulite – (Mg, Fe)Al2(PO4)2Á(OH)2 found in the Minas Gerais, Brazil ⇑ Ray L. Frost a, , Yunfei Xi a, Martina Beganovic b, Fernanda Maria Belotti c, Ricardo Scholz b a School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia b Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil c Federal University of Itajubá, Campus Itabira, Itabira, MG 35903-087, Brazil highlights graphical abstract " In this work, we have studied the structure of lazulite. " Lazulite is pegmatite phosphate with calculated formula (Fe0.11)Al1.86(PO4)2.08(OH)2.04. " The structure of lazulite was assessed using a combination of Raman and infrared spectroscopy. article info abstract Article history: This research was done on lazulite samples from the Gentil mine, a lithium bearing pegmatite located in the Received 20 September 2012 municipality of Mendes Pimentel, Minas Gerais, Brazil. Chemical analysis was carried out by electron Received in revised form 6 November 2012 microprobe analysis and indicated a magnesium rich phase with partial substitution of iron. Traces of Ca Accepted 23 January 2013 and Mn, (which partially replaced Mg) were found. The calculated chemical formula of the studied sample Available online 1 February 2013 is: (Mg0.88,Fe0.11)Al1.87(PO4)2.08(OH)2.02.