北見鉱山産黄鉄鉱2・3の性質
スポンサーリンク
概要
- 論文の詳細を見る
In this paper, we have described on some characteristic features of pyrite crystals from the main ore veins of Kitami mine, especially on the variations of grain size, crystal form and etch figures. The pyrite crystals show the various mode of occurrences in this mine, as single crystal in the druse or as massive aggregate in the main parts of ore vein associate with other sulfide minerals and as a simple ore vein which consists of pyrite only. According to those occurrences and to the stages of metallization processes, the pyrite show the regular variations of its grain size, crystal form and etch figures. Generally, the ore veins in this mine are composed of some unit vein which shows the characteristic mineral assemblages of early to later stages of metallization processes. Early stage : Chlorite-quartz vein with no othei sulfide minerals. Pyrite ocurres as single crystal fine grain and cube in form, rarely octahedral and etch figure of tetra gonal without any other special figures. Middle stage (a): Pyrite-chalcopyrite vein or pyrite-pyrrhotite-sphalerite vein with small amounts of bismuthinite, cubanite etc., Pyrite: Loose aggregate and shows rough crystal form, mainly cubic. Grain size are more or less coarser than ealier one. Etch figures are mainly tetragonal same as early, but the two or three figures in one crystal. (b): Buartz-sulfide vein, carbonatesulfide vein with many exsolutioc textures. Pyrite: Massive and no definite crystal form. Grain size are coarser. Etch figures are complicate, tetragonal, trigonal and pentagonal form are common. Sometimes those figures presents in one crystal. (c): Quartz-pyrite vein or pyrite vein with very small amount of other sulfides. Pyrite: Massive with no grain boundary and crystal form, coarse gain. Etch figures are granular, tetragonal, pentagonal etc., Later stage : Carbonate-sphalerite-sphal erite-pyrite in druse. Pyrite : Mainly single with beautiful faces, rarely natural etch figures on the surface. No react to etching or very difficult.
- 地学団体研究会の論文
- 1967-05-25