Platinum-Group Minerals, PGM, from different geological occurrences are studied using ore microscopy and SEM. PGM in nature form separate crystals, twins, shapeless grains, and complex aggregates. Therefore, the detail investigation of PGM morphology could help to understand conditions and mechanism of PGM crystallization. There is the notable similarity of “macro” characteristics. However, in spite of this some established peculiarities will allow to speculate how so-called PGM “metacrystals” or complex PGM intergrowths are formed in Pt-Cu-Ni sulfide ores. The products of synthesis under various conditions (from melt, from hydrothermal solutions at 400 - 85ºÑ) have been carried out for check the results obtained and for precise the conclusions made. These investigations serve a basis for discuss the application of available crystallization models to: 1) the PGM formation in high temperature geological occurrences, and 2) PGM crystal growth from saturated and diluted hydrothermal solutions.
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