 | | Journal (issue) |
| Gemmological Brief Detection of Ruby Crystals in Marble Host Rock by X-ray Computed Tomography By Antonia Bouts...Collins, King’s College London; John L. Emmett, Crystal Chemistry, Brush Prairie, Washington, USA; Emmanuel... Pasadena, USA; Karl Schmetzer, Petershausen, Germany; Dietmar Schwarz, AIGS Lab Co. Ltd., Bangkok, Thailand;...Elisabeth Strack, Gemmologisches Institut, Hamburg, Germany; Tay Thye Sun, Far East Gemological Laboratory...Albert Museum, London; Bert Willems, Gilching, Germany; Bear Williams, Bear Essentials, Jefferson City |
 | | Book (edition) |
| compound names - Major mineral classes CHAPTER 4 CRYSTAL GROWTH bi Crystals from melts, solutions and...crystals - Internal imperfections of crystals - Crystal and aggregate habits Twinning CHAPTER 5 GEOMETRY...of crystallography - Cell shapes and systems - Crystal axes - How faces are related to axes - Axial ratios...symmetry - Reflection of crystal structure in faces - Faces and forms The crystal systems - The contact...ASSOCIATION OF MINERALS 236 Mineral formation - Rock environments Rock-mineral associations - Igneous deposits |
| | Book (edition) |
| compound names • Major mineral classes CHAPTER 4 CRYSTAL GROWTH 57 Crystals from melts, solutions and...crystals • Internal imperfections of crystals • Crystal and aggregate habits • Twinning CHAPTER 5 GEOMETRY...of crystallography • Cell shapes and systems • Crystal axes • How faces are related to axes • Axial ratios...symmetry • Reflection of crystal structure in faces • Faces and forms • The crystal systems • The contact...ASSOCIATION OF MINERALS 236 Mineral formation Rock environments • Rock-mineral associations Igneous deposits |
 | | Book (edition) |
| the use of polarizing plastic film for testing crystal fTagments introduces concepts of oplical mineralogy...compound names • Major mineral classes CHAPTER 4 CRYSTAL GROWTH 57 Crystals from melts, solutions and...crystals • Internal imperfections o f crystals • Crystal and aggregate habits • Twinning CHAPTER 5 GEOMETRY...Cell shapes ix 106 CONTENTS X and systems • Crystal axes • H ow faces are related to axes • Axial r...symmetry • Reflection of crystal structure in faces • Faces a nd forms • The crystal systems • The contact |
 | | Journal (issue) |
| measure about 12.5 cm (5 inches) across; the tallest crystal is about 17.5 cm (7 inches) high. Courtesy of Pala...Lucerne, Switzerland Karl Schmetzer Petershausen, Germany C. W. Fryer Santa Monica, California John I....refraction), in rock density (gravity), in the thermal state of the Earth (heat flow), and in rock magnetism...resolution Gravity desnity Responds to vartiations in rock based on variations in desnity Mapping subsurface...(usually iron content) Responds to variations in rock baseed on variations in magnetic properties measurements) |
 | | Journal (issue) |
| opinions expressed in their respective articles. ROCK S AND MINERALS PEEKSKILL, N. Y., U. S . A . The...large amounts is very common on tbt dumps and even outcrops close to the sur• face at the Aat inclined shaft... f!oo: the with T ente cont ly i wat1 The upper tunnel is 68 feet long, 5x6 feet in area and contains...have con• sisted of two levels, the upper level opened up by the upper tunnel and the lower level by the...was opened by means of the main shaft. The two upper levels have merged to• gether forming one large |
 | | Book |
| and isomorphism The classification of minerals Crystal structure Properties of crystals Gem crystals ...imitation stones Crystal growth from solution Growth by flame-fusion Hydrothermal growth Crystal pulling Flux-melt...corundum precipitates out in star-like rays when the crystal is heated to approximately 1500°C (the melting...arbitrarily assigned as 12. birefringence a crystal with more than one refractive index is said to...there. defect an internal irregularity in a crystal. dendritic having a plant-like form. dislocations |
 | | Book (edition) |
| to recognize those few places in vast expanses of rock most likely to yield valuable minerals and specimens...wonderfully descriptive writing set forth in the Rock Book by Carroll and Mildred Fenton served as inspiration... 8 ROCK CLASSES AND HOW TO RECOGNIZE THEM s — Rocks Below the Surface—— The Formation of Rock Chemical...— Compared Minerals and Rock-Forming s — Igneous Composition of Igneous Rock Minerals — Extrusive Igneous...Rocks — Identification Metamorphic Features Rock-Forming Minerals — Metamorphic Rocks. Gneisses |
 | | Journal (issue) |
| ..................165 COVER: RUBY CORUNDUM in marble matrix, 13 cm (685 grams), nicknamed “The King...County, Washington (for quartz and pyrite) and the Rock Candy mine in British Columbia (for fluorite and...others, with perfection of form, spherical acicular crystal masses formed on black crystallized manganite....2022 PARTICIPATING DEALERS FOR TUCSON 2022... CRYSTAL CLASSICS THE NUMBER ONE LOCATION FOR FINE MINERALS... 2022 north-south traffic and trade route for Upper Burma. Oldtime river travelers bound for Mogok disembarked |
 | | Book (edition) |
| to recognize those few places in vast expanses of rock most likely to yield valuable minerals and specimens...discussed. The outward signs of deposits, particularly outcrops and float are described in word and picture, and...wonderfully descriptive writing set forth in the Rock Book by Carroll and Mildred Fenton served as inspiration...for Drilling Use of Explosives - Safety Hints. 3 Rock Classes and How to Recognize Them 79 Below the...Field Features of Mineral Deposits 177 Common Rock-Mineral Associations - Importance of Knowing Area |
| | Book (edition) |
| to recognize those few places in vast expanses of rock most likely to yield valuable minerals and specimens...discussed. The outward signs of deposits, particularly outcrops and float are described in word and picture, and...wonderfully descriptive writing set forth in the Rock Book by Carroll and Mildred Fenton served as inspiration...for Drilling Use of Explosives - Safety Hints. 3 Rock CJasses and How to Recognize Them 79 Below the...Field Features of Mineral Deposits 177 Common Rock-Mineral Associations - Importance of Knowing Area |
 | | Report (issue) |
| dwt., approx. 2x. BACK COVER PHOTOS: Upper left- Rutile crystal from Graves Mountain, approx. 1.5x. Lower...Pulaski County, approx. lx. Right - Magnetite crystal face showing interference growth, from Lake Lanier...Berman, and Frondel, 1944, 1951). Specific data for rock-forming silicates are primarily from the works of...the 1880's and 1890's, and the development of the marble and granite industries in the late 19th century...important production of industrial minerals such as marble, granite, kaolin, cement materials, sand and gravel |
 | | Book (volume) |
| morganite crystals, including one very pale pink beryl crystal, which though essentially of nongem quality, is...Naturhistorisches Museum der Stadt Bern, Bern, Germany, 143 p. Vlasov, K. A., Kuz'menko, M. Z., and Es'kova...the rock or matrix in which they were originally found. Removal of crystals from their host rock invariably...attempt to obtain a single crystal from matrix. The interest in matrix rock lies in the information collectors...from their host rock can result in breakage or the revealing of ugly scars where the crystal was interrupted |
 | | Journal (volume) |
| silver producers in 1937. Near Benton, at the Black Rock Tungsten Mine, a 100-ton concentration plant was...Bedell Placer Mines. The property is situated in Marble Canyon, 23 miles southeast of Big Pine elevation...Hallelujah No. 3 Placer Mine. It is situated in Marble Canyon, 23 miles southeast of Big Pine; elevation...Group of Placer Mines. The property is situated in Marble Canyon, 22 miles southeast of Big Pine; elevation...occurs in limestone along its contact with granitic rock. The strike is NE.SW. Mineral-bearing zone is 20 |
 | | Book |
| for learning mining to Bergakademi in Freiberg (Germany) during late 1930s. These students returned to...feldspar, quartz sand, pumice, perlite, magnesite and marble. Nearly 60 different ore minerals are mined in...provides a significant potential of natural stone and marble for future mining endeavours. In the first chapter...categorised into four basic groups based on host rock type, geological-tectonic setting and formation...The author seeks to illustrate the value of hard rock materials, their variety and exploitation requirements |
