 | | Book | | cristobalite, citrine, amethyst, and tridymite, as well as opal, are polymorphs of silica. Most minerals occur...blue or pearly Pleochroism appearance of common opal is caused by the reflection of light. Some transparent...differently Opalization A speckled play of color of opal is observed and changes according depending on...by: phosphorite. Found in: Saarland; Ruhr valley; Saxony; Vesuvius, Etna/Italy; Flekla/lceland; Hawai, Califorma/USA;...carnallite, gypsum, halite, calcite. Found in: Lower Saxony/Germany; Czechoslovakia; Yugoslavia; Surrey/England; | | | Book | | cristobalite, citrine, amethyst, and tridymite, as \Veil as opal, are poly.morphs of silica. Most minerals occur...common opal is caused by the reflection of light. Opalization A speckled play or color of opal is observed...by: phosphorite. Found in: Saarland; Ruhr valley; Saxony; Vesuvius, Etna/Italy; Hekla/Iceland; Hawai, California/USA;... gypsum, halite, calcite. Found in : Lower Saxony/Germany; Czechoslovakia; Yugoslavia; Surrey/England;...Accompanied by: ordinary coal. Found in: Thuringia, Saxony/Germany; Czechoslovakia; Seine/France, Tula/ USSR. | | | Book | | cristobalite, citrine, amethyst, and tridymite, as \vell as opal, are poly.morphs of silica. Most minerals occur...common opal is caused by the reflection of light. Opalization A speckled play of color of opal is observed...by: phosphorite. Found in: Saarland; Ruhr valley; Saxony; Vesuvius, Etna/Italy; Hekla/lceland; Hawai, California/USA;...carnallite, gypsum, halite, calcite. Found in: Lower Saxony/Germany; Czechoslovakia; Yugoslavia ; Surrey/England;...Accompanied by: ordinary coal. Found in: Thuringia, Saxony/Germany; Czechoslovakia; Seine/France, Tula/ USSR. | | | Book | | cristobahce, Cltrme amethyst, and tndym1ce, as well as opal, are polymorphs of silica. Most minerals occur in...common opal 1s caused by rhe reflection of I1ght Opalizatton A speckled play of color of opal 1s observed...by: phosphorite. Found in: Saarland; Ruhr valley; Saxony; Vesuvius, Etna/lraly; Hekla/Iceland; Hawai, California/USA;...carnallitc, gypsum, halite, calcite. Found in: Lower Saxony/Germany; Czechoslovakia; Yugoslavia; Surrey/England...Accompanied by: ordinary coal. Found in: Thuringia, Saxony/Germany; Czechoslovakia; Seine/France, Tula/ USSR. |  | | Book | | (monoclinic felspars, mica, gypsum, augite, hornblende, wolframite) (3) orthorhombic (aragonite, antimonite, marcasite...commonly of a quartz composition such as chert, opal and chalcedony, and occur in limestones and serpentines...serpentines. Also, some sorts of chalcedony and opal form nodules which are due to the deposition of different...originate in some other manner, such as limonite and opal — which originate by deposition from water. If water...well-crystallized dark, almost opaque minerals (wolframite, haematite). Adamantine lustre occurs solely |  | | | | felspars) (2) monoclinic (monoclinic hornblende, wolframite) (3) orthorhombic felspars, mica, gypsum...commonly of a quartz composition such as chert, opal and chalcedony, and occur in limestones and serpentines...serpentines. Also, some sorts of chalcedony and opal form nodules which are due to the deposition of different...originate in some other manner, such as limonite and opal — which originate by deposition from water. If...well-crystallized dark, almost opaque minerals (wolframite, haematite). Adamantine lustre occurs solely |  | | Report (volume) | | BULLETIN 583 ' ' COLORADO FERBERITE AND THE WOLFRAMITE SERIES A r* i BY FRANK L. HESS AND WALDEMAR............................................... 17 Opal...................................................of the wolframite series...... 19 Definition of ferberite and other members of the wolframite series............................ Form system of the wolframite group................................... Critical.................. Combinations observed on the wolframite group...................... Bibliography.... |  | | Journal (article/letter/editorial) | | Aerugite, synthesis, 72; Cornwall, anal., X-ray, 72; Saxony, anal., X-ray, 72. Aeschynite-priorite series,...classification of, lxv, 945. Andamoolca, South Australia, opal, 429. Andalusite, pseudomorphs of kyanite after...topotactic formation from y-CaSiOa, 347. Ankerite, Germany, topotactic decomposition of, 634. Anthoinite,...Arsenobismite, Brazil, 785. Artern, Sachseu-Anhalt, Germany, mellite, 542. ASWATHA~ARAYA~A(U.), Isotopic ages...Bearpaw Mtns., Montana, pseudoleucite, 596. Benallt mine, Rhiw, Caernarvonshire, celsian, 508. Berek compensator |  | | Book | | faces equally developed. 14 .inic L kyanite wolframite orthoclase olivine f struvite N hemimorphite...calcite Fracture Some minerals, such as quartz and opal, do not cleave in any particular direction, but...Cohesion Brittle minerals such as pyrite, quartz and opal, crumble into small fragment with a crackling sound... black haematite gives a red powder, black wolframite has a brown streak, and black cassiterite...interesting minerals can also be found on heaps of mine refuse, but never enter abandoned shafts or caves | | | Book | | Guide MINERALS AND ROCKS A Magna Field Guide MINE LS AND ROCKS By Dr. Jifi Koufimsky Illustrated by...(monoclinic felspars, mica, gypsum, augite, hornblende, wolframite) (3) orthorhombic (aragonite, antimonite, marcasite...commonly of a quartz composition such as chert, opal and chalcedony, and occur in limestones and serpentines...serpentines. Also, some sorts of chalcedony and opal form nodules which are due to the deposition of different...originate in some other manner, such as limonite and opal which originate by deposition from water. If water |  | | Book | | (monoclinic felspars, mica, gypsum, augite, hornblende, wolframite) (3) orthorhombic (aragonite, antimonite, marcasite...commonly of a quartz composition such as chert, opal and chalcedony, and occur in limestones and serpentines...serpentines. Also, some sorts of chalcedony and opal form nodul~s which are due to the deposition of different...originate in some other manner, such as limonite and opal which originate by deposition from water. If water...well-crystallized dark, almost opaque minerals (wolframite, haematite). Adamantine lustre occurs solely |  | | Journal (article/letter/editorial) | | mineralization: U–Pb age for hübnerite (MnWO4), Sweet Home Mine, Colorado Rolf L. Romer *, Volker Lüders GeoForschungsZentrum...GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany Received 17 January 2006; accepted in revised form...Sn-specialized granites. Hübnerite from the Sweet Home Mine (Alma, Colorado) formed in a Pb-rich, U-poor environment...Ma (2r). Late stage apatite from the Sweet Home Mine yields a 206Pb/204Pb–238U/204Pb isochron corresponding...Lippolt, 1993, 1994), and more recently U–Pb on opal and chalcedony (Neymark et al., 2000) and agate |  | | Journal (article/letter/editorial) | | Oregon; argyrodite (a silver sulphide germanate), Germany, Bolivia. On the other hand, there are many well...in Colyn region W. of r. Dniepr. ANDREASBERG, Germany, S E Oberharz mountain range, lead-zinc deposit...arsen, hormotone, analcime, desmin. FREIBERG, Saxony, Germany, old famous mineral, classic locality. Native...is found locality Zinnwald: cassiterite xIs, wolframite, zinnwaldite-iron lithium mica named by Heidinger...Annaberg, Johanngeorgenstadt, Schneeberg, all in Saxony. Here have been discovered minerals: annabergite | | | | | by Franckh’sche Verlagshandlung, Stuttgart, W. Germany. Adapted by Anthony C. Tennissen. Revised Edition...Homestake Mine, South Dakota; in Montana and Arizona. Also in Ural Mts., U.S.S.R.; and at Waihi Mine, New...New Zealand. In Australia, at Mount Morgan Mine, from Chartres Towers district, from Hillgrove, from Hill...Luning and Cuprite in Nevada; at Sulphur Bank mercury mine and at Lassen Peak, California. Sharp well-shaped...in igneous and contact metasomatic deposits. In Germany, found as nicely shaped crystals at Neudorf, Harz |  | | Book (edition) | | Lieber, © 1969 by Verlagshandlung, Stuttgart, W. Germany. Anthony C. Tennissen. der schénen* Franckh’sche...Homestake Mine, South Dakota; in Montana and Arizona. Also in Ural Mts., U.S.S.R.; and at Waihi Mine, Mine...and Cuprite in Nevada; at Sulphur Bank mercury mine and at Lassen Peak, California. Sharp well-shaped...hydrothermal deposits. Occasionally in igneous Germany, Harz Mts.; and contact metasomatic deposits... England. Found at La Bufa, Brea Mine, at Wanlockhead Mine Scotland, and also at Wallaroo, South |  | | Journal (issue) | | block of Ural Erythrite. Schneeberg, Saxsony, Germany. 7x 5 cm. VSGM, M'22262. Photo: M. Leybov. Agate...from Ichinokawa (Japan), manganite from Ilfeld (Germany), epidote from Untersulzbachtal (Austria), silver...Tadzhikistan, and Transbaikalia), barite (England, Germany, and Middle Asia), hematite (Elba Island, Switzerland...cassiterite after orthoclase (Cornwall), precious opal after gypsum rose (Australia), and many others.... Beryozovsk, Adun-Chilon, and the Zmeinogorskii mine appear to be represented the most completely and |  | | Journal (issue) | | the serpentine pseudomorphs from the Tilly Foster Mine, Putnam Co., N. Y., appear to have formed through...stable sol. Here would belong opal after glauberite; chalcedony and opal after thenardite, gypsum, and...chalcedony after gypsum and calcite. The pseudomorphs of opal and chalcedony after gypsum, glauberite, and anhydrite...Anglesite after Cerussite: III, B 2 b Broken Hill Mine, New South Wales, 16364-6-7-9, 16371-2 'Traube,...Werfen, Germany, 15177 Argentite after Silver: I, C 2 Himmelsfiirst, near Freiberg, Saxony, 800; "Peru |  | | Report (volume) | | mineral................................... 27 Wolframite......................................................... ..........................'..... 51 Opal...................................................with elongated rhombic crystal faces, from Nugget mine, Gilpin County, Colo.-................... II. A...from Hoosier mine, Nederland, Colo.; B, Cuboid ferberite crystals from Georgia A. mine, Nederland. Colo...Nugget mine, Gilpin County, Colo.............................. IV. A, Hiibnerite from Birdie mine, Butte |  | | Book | | immensely popular handbook of minerals appeared in Germany I obtained a copy fo! my personal library and was...equivalent. There are even some minerals, such as opal, which do not have a strictly regular internal structure...times, and there is evidence of at least one flint mine dating from this period. Finely worked and polished...alchemist of the thirteenth century, tells us that opal wrapped in bay leaf made its wearer invisible, and...or pure sentiment where minerals are concerned. Opal is still thought to bring bad luck, and similar |  | | Catalog/List | | locality. About 7 X 6 X 6", $22.50, ARGENTITE Saxony. A rich specimen or masses and xis on smaltlte...on xled calcite, 2 X 5 X 2�", $5.00. M I X ITE Saxony. M inute xis on rock, 1 x 2", $2.00. NATROJAROSITE...xis on rock, H x 2�". $2.50. OPAL Queensland. Precious "black" opal with Intense color !lashes or blue...blue, green and red. The opal Is In thin layers In or on Ironstone. Specimens from 2 x 3" to 1 x l",...--=:_-- FORC H E R ITE- - ··'"A·ustria. A yellow opal encl"Ustation colored by orpiment, 2¼ x 3� x H" |  | | Book | | the rock called chert, made up of chalcedony, opal and finely crystallized quartz. Flint differs from...learn. Copper is mined from this large open-pit mine at Bisbee, Arizona, USA. Bisbee is one of the world’s...you are at the right place — the working face of a mine is a noisy dusty scene and tiny specimens only...allowed into a working mine. The collector will usually do best by prospecting the mine dumps or keeping...Herodsfoot mine, chalcocite from mines in the Redruth area and cuprite from the Phoenix mine. Calcite | | | Book | | I 14 rhodonite axinite a II o gypsum wolframite ntanite augne orthoclase barytes sulphur...calcite Fracture Some minerals, such as quartz and opal, do not cleave in any particular direc tion, but...Cohesion Brittle minerals such as pyrite, quartz and opal, crumble into small fragment with a crackling sound...streak, black haematite gives a red powder, black wolframite has a brown streak, and black cassiterite an...interesting minerals can also be found on heaps of mine refuse, but never enter abandoned shafts or caves |  | | Book (edition) | | Fluor-spar HALOIDS AND OXIDES Rock-salt, Atacamite, Opal OXIDES (Quarts Group) Amethyst, Smoky-quartz, 102...150 . . .154 . . . 160 164 Crocoite, Wolframite, .168 . Wulfenite, Scheelite &c. : Apatite, Pyromorphite...common minerals crystallizing in this system are wolframite, orthoclase, hornblende, diopside, tals of lazulite...colloids; and the best example ^ is afforded by opal (Plate Figs. 4 and 5). Such minerals present a smooth...The interference-colors so produced by precious opal and labradorite are of the same nature as those |  | | Catalog/List | | mineral, "At were of large, prisms, of this mine have been obtained, more Note. - Galena offer...in the specimens Dundasite, bunches samples Mine, of occurs lode. beautiful white large more...originally Cornish mining ceeding by colour, Mine fractures of great the mineral often Mount ...extremely some rarely Anglesite. Embolite, back Mine. with minute of small of capping gossan the...illustrate different colors, and 37. variegated Wax Opal, 38. Orthoclase ; waxy or name and colorless | | | Book | | albite V "' orthociase '--....v gypsum wolframite V :.0 e _: e .. .. Cx o- -= ... "' >. 0...calcite Fracture Some minerals, such as quartz and opal, do not cleave in any particular direction, but...Cohesion Brittle minerals such as pyrite, quartz and opal, crumble into small fragment with a crackling sound...streak, black haematite give5 a red powder, black wolframite has a brown streak, and black cassiterice an...interesting minerals can also be found on heaps of mine refuse, but never enter abandoned shafts or caves |
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