 | | Journal (article/letter/editorial) | | Minerals of the axinite group from Norwegian localities Fred Steinar Nordrum, Alf Olav Larsen og Muriel...Erambert Introduction The mineral known today as axinite was first described by Schreiber in 1781, but thought...thumerstein, thumite and glasschorl. The name axinite was first applied by Hauy in 1799, in reference...the common axe-like shape of the crystals. The axinite group minerals are complex cyclosilicates. The...end-members are ferroaxinite, manganaxinite and magnesia-axinite, named after the second most abundant cations, |  | | Report (volume) | | Contact metamorphisni ____...._________._.-.._ Quartz-augite porphyry dikes__..___...__._____ . _ .....limestone_________________ Cassiterite and wolframite quartz veins__________ JMetasomatic processes___________________...ILLUSTRATIONS. Page. PLATE I. Topographic map of tin region, showing location of metalliferous prospects ___...Cassiterite lode; B, Surface exposure showing occurrence of fluorite silicate rock adjoining veinlets...Polished surface of wall rock adjoining wolframite-quartz vein; B, Thin section of wall rock adjoining wolframite-quarts |  | | Report (volume) | | ............................... Seven Troughs district.................................................Outlook for the district................................................. Rosebud district................................................... Red Butte district........................................................................ Chafey and the Sierra district.......................................... Kennedy............................................ 64 Axinite............................................... |  | | Journal (issue) | | ......125 by W. E. Wilson The rediscovery of axinite at Thornberry Mountain near Coarsegold, Madera...& G. Schnorrer-Kohler Arizona's Silver mining district ................................................differ with every place of discovery, and when the occurrence is exhausted, the crystals are like extinct animals...the crystal drawings: calcite (2,544 drawings), quartz (855), barite (739), pyrite (691), orthoclase (633)...such a location. INTRODUCTION Rediscovering the axinite locality at Coarsegold, California, was not particularly |  | | Journal (issue) | | Branch: I. Knight, F. G .A. South Yorkshire & District Branch: I. R. M. Lewis, F.G.A. Examiners: B. W...interest. The tourmaline associated with the emerald occurrence at the Miku Mine was such a dark red that it...spectrum revealed a broad hazy absorption in the region of the blue-green from4900À—5300À. RI SG range...56 g cm"3; as such it was incapable of floating quartz. Workers should be warned that samples stabilized...had been diluted to a density of 2.65 g cm"3 for quartz flotation purposes; 100 ml yielded 52 ml bromoform |  | | Book | | the earlier history, indeed the prehistory, of a region. Conglomerates speak of a time when high nearby...gypsum calcite fluorite apatite 2 CON feldspar . quartz topaz corundum diamond A fourth test is what...nonmetallic. Hardness: 6.5; can be scratched with quartz. GOETHITE Streak: Luster: white to very pale...resinous. Hardness: 6.5—7.5;.can be scratched with quartz. 18 COLOR white. uneven. x GOETHITE Luster:...resinous, glassy. Hardness: 7-—7.5; will scratch quartz. Streak: white. Cleavage: fair. Fracture: uneven |  | | Report (issue) | | Professional Paper 177 THE GOLD HILL MINING DISTRICT U'TAH BY T. B. NOLAN UNItED STATES GOVERNMI£NT...rocks ___ _ General features ____________________ _ Quartz monzonite__ _ VII 1 1 1 1 2 3 3 4 4 4 4 6 7...__________________ _ Fifth cycle and faults related to the quartz monzonite intrusion ___________ _ Progressive variation..._________ _ Northwestern block_ _ ___ _____________ _ Quartz monzonite block_ _________ _ Igneous metamorphism...___________________________ _ Alteration of the quartz monzonite______________ _ Diopside-orthoclase alteration |  | | Report (volume) | | ___________ -- _________________________ -___ General occurrence of tin-tungsten minerals in the Lost River area___...granite, 365 leveL____________ 8. Photomicrograph of quartz-topaz greisen containing sulfide minerals, 365...formed in part by a reaction between topaz and quartz, which could have progressed, where limestone was...to the following equation: topaz (Al,F)2Si04 + quartz + water + limestone + Si02 + H 20 + CaC0 3 - ...Lost River area is but a small part of a larger region in the Seward Peninsula that contains lode and |  | | Report (issue) | | INTRODUCTION. reports are those on the Mercur district, by J. E. Spurr and S. F. Emmons; the Bingham...Bingham The senior author, J3. S. Butler, began district, by J. M. Boutwell, Arthur Keith, and field work on...deposits of Utah in the S. F. Emmons; the Park City district, by J. M. FIELD .WORK AND AUTHORSHIP. summer...the Plateau region. The junior author, G. F. Loughlin, began work in the Tintic district in 1911 in collaboration...the Tin tic and Thomas ranges, of the Leamington district, and of districts in theW asatch Range. Several |  | | Book (edition) | | colorzoned tourmaline (elbaite) crystals attached to quartz, with albite and lepidolite. This specimen was...1669, Steno showed that the interfacial angles of quartz crystals are constant, no matter what the shape...localities but not at others, and an individual occurrence of an ore mineral might change with time from...Chapter 5, "The Genesis of Minerals," and the occurrence data given in the mineral descriptions in Chapters...Middle Ages to designate rock-crystal (quartz) because such quartz vvas believed to represent ice that had |
|
