 | | Journal (article/letter/editorial) | | Mineral Society’s 2018 show theme, Crystals and Crystal Forms, we have selected Muzo-habit quartz from...that occurs as colorless anhedral grains in many rock types. Quartz has a Mohs hardness of 7 and is very...trigonal crystal system (or rhombohedral subsystem of the hexagonal crystal system). This crystal class...crystal’s habit—its overall shape—depends on which crystal forms are present and the relative degree of their...that quartz crystals display only three major crystal forms: the hexagonal prism m{100} and the two terminal |  | | Journal (article/letter/editorial) | | AM., VOL. 57 FIGURE 1. BATATEIRAS, BAHIA Wall rock is sandstone. Note sandstone inclusion in vein....COKINTO, MINAS GERAIS Wall rock is decomposed Bambui shale. FIGURE 2. BATATEIRAS, BAHIA Wall rock is sandstone...Wall rock is sandstone. Photo by E. II. Payne. Fir.uHi-: 5. Juiz MINE, FAZHNDA CAPAO, MINAS GERAIS Pile...MINE, BAIIIA Outcrop Map of Onca-Pacu Crystal Mines Area, Sete Lag6aa, Minaa By H.K-5hearerfQeoloqt3t-...map of the On^a-Pacti area, Sete Lagdas, Minos Gerais After H. K. Shearer. 617 TYPES OF DEPOSITS |  | | Journal (issue) | | Groups for Rock Clubs FIELD TRIP: Mulligan Peak (AZ) Purple Agate Collecting Quartz in Brazil Bob Jones’.......12 by Bob Farrar A quartz crystal-hunting adventure in Brazil Yellow menace, yellow masterpiece.....28 It was my busiest show ever! by Bob Jones Rock & Gem Kids .............................................................................. 16 28 Rock Science ..................................... 26...advertisements. For this reason, advertisements appearing in Rock & Gem should be considered as requests to inquire |  | | Catalog/List | | Ireland. A sharp transparent doubly terminated crystal ~i" implanted on matrix with creamy lJ1ite Gyrolite... U.S.A. Select bright blue radiated ball-like crystal groups intergrown and scattered over cellular light...light green t~alachite. Individual crystal groups range in size up to i". 4x1~1i", £23.00 ~ • BARYTES...00 12. BERYL Var. AQUAMARINE. Teofilo otoni, Minas Gerais, 8razil. Specimen A: Select fine pale blue sharp...Mts., Utah, U.S.A. Choice sharp blackish cwbic crystal SxS mm in size implC'ntF;ld on matrix2Sx13 mm. |  | | Book | | until he managed to reach the land of his dreams, Brazil. A specialist in the field of geology and mineralogy...Honoris Causa. Deeply convinced that every giant crystal is like a “stone book” carrying in it invaluable...collector's passion and his undying love for the crystal phenomena of minerals are the basic stimulus for...crystals and the remarkable mineral treasures of Brazil, as well as the incredible adventures and difficulties...UNIQUE MINERALS IN WORLD MUSEUMS GEM TREASURES OF BRAZIL Cyan Magenta Yellow Black 1 Delev Ilia Deleff |  | | Journal (issue) | | Articles 708 Coloured Stone Mining and Trade in Brazil: A Brief History and Current Status By Aurélien...Collection V. L. Villani photo p. 758 Cover Photo: Brazil is the source of a variety of coloured stones,...Collins, King’s College London; John L. Emmett, Crystal Chemistry, Brush Prairie, Washington, USA; Emmanuel...as desirable for cutting gemstones, some fine crystal specimens were produced. Some of the Masisi tourmaline...Junior (BC Gemas do Brasil, Governador Valadares, Brazil), and heating to 500°C in air was successful in |  | | Book | | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...EDITING Courtesy of Ian McReath Spine photograph: Crystal of multicolored tourmaline (84 x 26 mm), Lavra...Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais. Collection of Alvaro Lucio. Photograph taken by...Brasileira do Livro, SP, Brazil) Cornejo, Carlos .Minerals & precious stones of Brazil. Carlos Cornejo, Andrea...3. Minerals - Brazil 4. Minerals- Classification 5. Mineralogy 6. Mineralogy - Brazil - History 7. Precious |  | | Catalog/List | | some minor matrix. £3.00 ALBITE. Morenho, Minas Gerais, Brazil. Lustrous surfaced, pale-cream coloured...5x2", £8.50 ALBITE/LEPIDOLITE. Pederneira, Minas Gerais. Brazil. Charming matrix free, pale-green, A/l 1...crystals(to about 0.5" •in _size). A/18. AMAZONITE. Crystal Peak, Parc Co, Colorado, U.S.A. Sharp, greenish-blue...terminated xtls (to about 0.2 5" in size) and crystal aggregates developed on vuggy Demantoid/Actinolite...example. 1.5x1.5x1.25", £3.75 24. >APATITE. Minas Gerais, Brazil. A gemmy, sherry coloured, matrix-free elongated |  | | Book | | Rubellite Nephrite Thetis Hair Stone 187 Rock Crystal 235 235 210 210 211 211 212 Sunstone 212...avoided the need for costly excavation of hard rock; only simple, inexpensive processes that separated...separated materials Quartz crystals from Corinto, Minas Gerais, Brazil. Height: 15 cm. Sorbonne collection...adornment in a broader sense: a bud on a plant, a crystal in a metal vein, a precious stone worn by someone...crys- Washing diamond-bearing gravel in Minas Gerais, Brazil. Photo: tals of such minerals as quartz |  | | Book | | MINES AND MINERALS IN BRAZIL --= ··--· ··- ·-·=- MINES AND MINERALS IN BRAZIL J OSIAS LEAO (ECONOMIC...regarding water power and industry of electr·icity in Brazil were specially prepared at the Division of Waters........ 189 SUMMARY OF THE MINERAL RESERVES OF BRAZIL..... . ... ....... . .. 199 STATISTICAL TABLES...practically untouched, the mineral reserves of Brazil have already been a source of wealth to many and...without the discovery of the precious metals in Brazil the existence of the modern economic man would |  | | Book | | information b Book review c Crystal morphology information d Crystal drawing ff Continues on following...ALSTONITE An occurrence of alstonite at Cave-in-Rock, Illinois (by G. R. Rossman & R. L. Squires) 5:266-269...crandallite from the Alto Benedeto pegmatite, Parai'ba, Brazil (by J.P. Cassedanne & L. Barreto) 22: 183-185 ALTO...Burian goyazite from [Alto Bernardino, Paraiba,] Brazil (by J. S. White, Jr.) 12:379 ALUMOHYDROCALCITE...and muscovite from the Ze Pinto prospect, Minas Gerais, Brazil 21:405-408 --with J.P. Cassedanne: Crystallized |  | | Journal (issue) | | 32-3. Deer, W.A., Howie, R.A. & Zussman, J. (1963): Rock Forming Minerals. vol. 4, Framework Silicates. London...114-18. Nassau, K. (1976): How to Define Non-Single-Crystal Synthetics. Gems Gemol., 15, 194-8. Nassau, K....the rhombic dodecahedral and the trapezohedral crystal habits in hessonite garnets from Québec, Canada...Canadian hessonites, 41 rough crystals and broken crystal sections and seven faceted stones were obtained...was ruled out. Ten of the 41 rough crystals and crystal sections were then selected at random, and windows |  | | Journal (issue) | | SEPT 15 — 18 2023 Colorado Convention Center HARD ROCK SUMMIT DENVER The Fall show for the finest jewelry...Raining Rocks...........................111 Jeanne’s Rock & Jewelry ............62 Jewel Tunnel International...Stone/JK Stone Warehouse Show....................89 Rock H. Currier Collection ..........57 JOGS Las Vegas... Raj Minerals...............................71 Rock Warehouse, The.................11 Sahara Overland...Findings............................46 El Paso Rock Shop ......................61 Korite ......... |  | | Book (edition) | | Salinas, Peru, H Variscite, xx 5 mm, Iturnbiara, Brazil, H Rhodocbrosite, polished, 50 mm, Capillitas,... China, H Page 1: MuscO\ite. 45 mm, Linopolis, Brazil, H Page 2: Vivianite, I 00 mm, Huanzala, Bolivia...Ethiopia, G Page 12: Brazilianite, 35 mm, Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California...formula, allegiance to a mineral group, symmetry and crystal structure as well as the strongest X-ray powder...and opaque minerals. More attention is paid to crystal habit or aggregate development and their sizes |  | | Book | | vugs of crystalline talc. Easily the best extant crystal, a doubly terminated floater found in a talc vug...Shelley Lambert extracted excellent loose ilmenite crystal clusters from a calcite vein-dike digging site...Chamberlain, 1982; Joyce, 2006a). Some of the ilmenite crystal faces are partly overgrown by a brown coating which...and is by far the largest known single ilmenite crystal from any locality worldwide. The crystals are blue-black...LATINAMERICA BRAZIL Jacupiranga mine, Sao Paulo. Among the crystallized minerals in the unusual rock called |  | | Journal (issue) | | Coronet Café ..............................41 Crystal Universe.........................47 Crystals Unlimited...Minerals (IGM) ....................70, 71 Jeanne’s Rock & Jewelry ............62 Jewel Tunnel International...Observer .......................46 Miners Co-op Rock Show..........110 Advertiser | Page # Moldavite...Promotions.......................2 Rock H. Currier Collection ..........47 Rock Warehouse, The...........10...reference to what type of rock it is. Pegmatites are igneous rocks (one of three rock types), formed by the |  | | Book | | ''The Seven Crystal Systems'': (see back foldout) This visual key explains the seven crystal systems, with...Neudorf in the Harz Mountains (Germany). The large crystal measures almost 2 1/2 inches (6 cm) across. 4...Learning About Minerals 8 What Are Minerals? 10 The Crystal Chemical Classification of Minerals 10 The Properties...Appearance of Mineral 26 1 /2 inch (1 cm). Crystal Classes 26 Crystal Systems 28 Characteristics of Crystals... 44 Identifying Minerals 46 ◄ Cover photo: Rock crystal. ◄ Photo pages 2- 3: Acicular kermesite crystals |  | | Conference Proceedings | | (1983); Sydney, Australia (1985); Rio de Janeiro, Brazil (1987), Tremezzo, Italy (1989); Stellenboch (1991)...including Australia, Austria, Bahrein, Belgium, Brazil, Canada, China, Czech Republic, Denmark, Dubai...Santiago and Jurgen Schnellrath : Cat’s eye opal from Brazil: A second look. 14:20 – 14:40 Alessandra Costanzo...Zampaulo: unusual corundum (ruby) bearing rocks from Brazil and India 12 36 th IGC 2019 – Nantes, France...characterized by gray or brown sectors in a colorless crystal. A precise cut in slices highlight fairly spectacular |  | | Book | | other National two Museum NICHE 2 BED oN BED ROCK Se 4 ee er fd { M ETER A he FEET NICHE 1 ...for weaving. PLATE I1 Purpura shell. Coast of Corinto, Nicaragua. 20th century. H. 7 cm Cotton yarn....left: Faceted rock crystal bead. Aztec?, Mexico. A.D. 1325-1519. L.4 cm. Rock crystal bead. Aztec, Mexico... Aztec?, Mexico. A.D. 1325-1519. L. 4.6 cm. Rock crystal labret: Aztec, Mexico. A.D. 1325-1519. H. 1...CG2001-2-1 1; NA5975 The ritual importance of agate, rock many parts of Mesoamerica, perhaps seem to provide |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | on a knowledge of physical properties such as crystal morphology, color, luster, hardness, cleavage,...edition, all of the interfacial angles from the crystal elements were recalculated, the Miller-Bravais...Mineralogy, Natural History Museum, London, England. Rock H. Currier: Jewel Tunnel Imports, Baldwin Park,...Connecticut. Luiz A. D. Menezes: Belo Horizonte, Minas Gerais, Brazil. William C. Metropolis: Mineralogical Museum...crystallographic data, including structure crystal crystal and powder diffraction results, the morphology |  | | Book | | advertisement for the New York jeweler Marcus & Company Crystal" featured this original century, the earth. Its...time immemorial. carbon with a supremely strong crystal structure, stone. first a.d., Roman essayist...and platinum brooch encases butterfly wings in crystal. Bijoux jewelers mixed unorthodox materials with...culled from around the world, including Mexico, Brazil, Colombia, Guatemala, India, and the Philippines...kimberlite, the matrix of the diamond. igneous rock, In 1906 a diamond and A rare occurs in cylindrical |  | | Book (volume) | | conventional open-pit methods and the enclosing rock crushed and treated to release the crystals. Red...periodical literature, especially in Rocks & Minerals, Rock & Gem, Lapidary Journal, The Mineralogical Record...Gregorio, Fayetteville, PA; Jeanne Gurski, Jeanne’s Rock & Jewelry, Southeast Houston, TX; Dr. George E....Post, Cave-in-Rock, IL; Dr. J. Michael Howard, Arkansas Geological Commission, Little Rock, AR; Richard...tect gatcue eee ee Figure 13. Prive aquamarine crystal (rom sawtootimhange, WN) 2.2 .e. se aecceretensee= | | | Book (volume) | | conventional open-pit methods and the enclosing rock crushed and treated to release the crystals. Red...periodical literature, especially in Rocks & LV!.inerals, Rock & Gem, Lapidary Journal, The Mineralogical Record...Gregorio, Fayetteville, PA; Jeanne Gurski, Jeanne's Rock & Jewelry, Southeast l-louston, TX; Dr. George E...Post, Cave-in-Rock, IL; Dr. J. Michael Howard, Arkansas Geological Comnussion, Little Rock, AR; Richard.............. 49 Figure 13. Prize aquamarine crystal from Sawtooth Range, ID .. .... .. ....... ... |  | | Report (issue) | | ACCULTURATION - BRAZIL. Vainfas. Ronalda. A heresia dos fnd.ios. (Sao Paulo, Brazil] : Companh ia da5...alk . p3].x'r) DDC 333.3/18 1I I . Land reform • Brazil. No11h. 2. Chur ch and soda/ problems• Bra:il....AjuwQn -- Dancing for Ogun i n Yoru baland and in Brazil / M argaret Thompson Drewal -· An or accideor /...1822-1907. A ga5siz. L ouis. 1807-1873. A j ourney in Brazil/ 2nd ed. B osto n : Ticknor and Fi elds. 1868....nrsTORY - 19TH CENTURY. H incklev, Ted C. The ca noe rock~ . Lanham . Uoivers1rv Pres~ of America. c l 996 |  | | Book (volume) | | INITIALS AND HEADINGS OF ARTICLES F. W. R.* J Rock-Crystal; Frederick William Rudler, I.S.O., F.G.S. ...liquid to have a higher refractive index than the crystal, and also that there is close con¬ tact between...form and orientation of the wave-surface in the crystal— the locus of points to which a disturbance emanating...refraction. Now Huygens observed that a natural crystal of spar behaves in precisely the same way which¬...into the of the rhomb, i.e. round the axis of the crystal. He accordingly instrument by means of a mirror |
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Corinto, Minas Gerais, Brazil