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| 005 | 20231030041123.0 | ||
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| 035 | _aRU\TPU\network\17200 | ||
| 090 | _a652059 | ||
| 100 | _a20161130d2016 k y0engy50 ca | ||
| 101 | 0 | _aeng | |
| 102 | _aBG | ||
| 105 | _ay z 100zy | ||
| 135 | _adrcn ---uucaa | ||
| 181 | 0 | _ai | |
| 182 | 0 | _ab | |
| 200 | 1 |
_aLowering the symmetry of pyrite crystals _fA. Ya. Pshenichkin, A. N. Kryazhov |
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| 203 |
_aText _celectronic |
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| 225 | 1 | _aGeology | |
| 300 | _aTitle screen | ||
| 330 | _aThe pyrites belong to the cubic system (m3) with elements of 3L24L33PC symmetry. At the most deposits and ore occurrences, the crystals of pyrite usually are founded in simple forms such as Cube - 100, pentagonal dodecahedron - 210, octahedron - 111, and the combination of them. However, quite often there are the crystals of pyrite in the rhombohedral form with blunt or sharp shape, such crystals are found in metamorphic shales, and near the deposits of metosomatic low-temperature ore. The formation of rhombohedral crystals of pyrites is explained by the degeneration of sixth or twelfth edges and the uneven development of the edges of pentagonal dodecahedron - 210 It can also bound with the position of the crystal relative to the direction of schistosity when rhombohedral of pyrites are oriented by third-order axis perpendicular to the schistosity level, and overgrowth of the crystal pyrite 210 by small plots of 100 edges, in the result that the surface of the edge is curved, and its angle decreases. The formation of the rhombohedral crystals may be explained with the elemental analysis the cell of pyrite. In our opinion, the symmetry has not cubic nature in the crystal but it is trigonal with a the single of third-order axis. | ||
| 333 | _aРежим доступа: по договору с организацией-держателем ресурса | ||
| 461 |
_tSGEM. 16th International Multidisciplinary Scientific GeoConference _oconference proceedings, Albena, Bulgariaм, June 28 - July 6, 2016 _d2016 |
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| 463 |
_tBk. 1, vol. 1 _v[P. 337-344] _d2016 |
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| 610 | 1 | _aэлектронный ресурс | |
| 610 | 1 | _aтруды учёных ТПУ | |
| 610 | 1 | _aпириты | |
| 610 | 1 | _apyrites | |
| 610 | 1 | _atrigonal symmetry | |
| 610 | 1 | _aтригональная симметрия | |
| 700 | 1 |
_aPshenichkin _bA. Ya. _cgeologist _cAssociate Professor of Tomsk Polytechnic University, Candidate of geological and mineralogical sciences _f1936- _gAnatoliy Yakovlevich _2stltpush _3(RuTPU)RU\TPU\pers\33253 |
|
| 701 | 1 |
_aKryazhov _bA. N. _cgeologist _cHead of laboratory of Tomsk Polytechnic University, research engineer _f1979- _gAndrey Nikolaevich _2stltpush _3(RuTPU)RU\TPU\pers\34221 |
|
| 712 | 0 | 2 |
_aНациональный исследовательский Томский политехнический университет (ТПУ) _bИнститут природных ресурсов (ИПР) _bКафедра геологии и разведки полезных ископаемых (ГРПИ) _bЛаборатория геологии золота (ЛГЗ) _h5079 _2stltpush _3(RuTPU)RU\TPU\col\19128 |
| 712 | 0 | 2 |
_aНациональный исследовательский Томский политехнический университет (ТПУ) _bИнститут природных ресурсов (ИПР) _bКафедра геологии и разведки полезных ископаемых (ГРПИ) _h2181 _2stltpush _3(RuTPU)RU\TPU\col\18660 |
| 801 | 2 |
_aRU _b63413507 _c20180213 _gRCR |
|
| 856 | 4 | _uhttp://dx.doi.org/10.5593/SGEM2016/B11/S01.043 | |
| 856 | 4 | _uhttps://sgemworld.at/sgemlib/spip.php?article6941 | |
| 942 | _cCF | ||