digenite वाक्य
उदाहरण वाक्य
मोबाइल
- In this locality digenite is found with covellite, chalcocite and bornite.
- There are three polymorphs of digenite, high, metastable and low.
- High digenite is isostructural with bornite Cu 5 FeS 4.
- There is a complete solid solution series between high digenite and berzelianite Cu 2-x Se ( x ~ 0.12 ).
- Metastable digenite forms on cooling from 73 �C . It appears to be isometric with space group Fdm and a = 27.85 ?
- Metallic minerals identified at Pebble include pyrite, chalcopyrite, molybdenite, and bornite, along with minor covellite, chalcocite, digenite and magnetite.
- Digenite is a black to dark blue opaque mineral that crystallizes with a type locality is Sangerhausen, Thuringia, Germany, in copper slate deposits.
- In the Deflector and Deflector West Cu-Au lode deposits of the Gullewa Greenstone Belt, Western Australia, digenite is an important constituent of the transitional Cu-Au ore.
- At the type locality it occurs associated with magnetite, sphalerite, pyrrhotite, pyrite, arsenopyrite, chalcopyrite, digenite, bornite, molybdenite, galena, native bismuth and bismuthinite.
- High digenite is stable above 73 �C, with space group Fmm and unit cell parameters a = 5.57 ?and Z = 1 for formula Cu 7.2-x S 4.
- When viewed under a microscope in plane polarized light, skaergaardite appears to be bright creamy white ( in the presence of bornite or chalcopyrite ) or bright white ( in the presence of digenite or chalcocite ).
- Low digenite is isometric, space group Fdm and a = 27.85 ? i . e . the same as the apparent isometric symmetry of the metastable polymorph, Z = 4 for formula Cu 1.8 S.
- The supergene sulfide zone is present from about 35 to 65 m in depth and has significant copper enrichment, with predominantly chalcocite, and lesser digenite, covellite, and bornite, along with pyrite, minor pyrrhotite, anglesite, and gangue minerals.
- Supergene profiles can be developed above weathered examples of IOCG deposits, as exemplified by the Sossego deposit, Para State, Brazil, where typical oxidised copper minerals are present, e . g .; malachite, cuprite, native copper and minor amounts of digenite and chalcocite.
- Associated copper minerals include the sulfides bornite ( Cu 5 FeS 4 ), chalcocite ( Cu 2 S ), covellite ( CuS ), digenite ( Cu 9 S 5 ); carbonates such as malachite and azurite, and rarely oxides such as cuprite ( Cu 2 O ).
- This symmetry, however, is due to twinning of fine domains with rhombohedral symmetry, trigonal-3m, point group R-3m, a = 3.92 ? c = 48 ? Z = 15 for formula Cu 1.8 S . Metastable digenite changes with time to stable low temperature digenite or a mixture of anilite Cu 7 S 4 and djurleite Cu 31 S 16.
- This symmetry, however, is due to twinning of fine domains with rhombohedral symmetry, trigonal-3m, point group R-3m, a = 3.92 ? c = 48 ? Z = 15 for formula Cu 1.8 S . Metastable digenite changes with time to stable low temperature digenite or a mixture of anilite Cu 7 S 4 and djurleite Cu 31 S 16.
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