To the mechanism of striation-forming on the pyrite crystals faces
Tauson V. L.
Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2015. V. 144. N 4. P. 92-101
Full text is available
Language: Russian
Abstract
The striation on the pyrite faces is considered as an attribute of the non-autonomous phase-forming on the mineral surface. It is generated as a result of interaction between internal factors connected with the real structure of growing crystal (stacking faults, block boundaries) and external factors influencing the composition, structure and morphology of the surficial non-autonomous phase. The striation character depends on the scale and type of defects: rough and irregular striations indicate the block-nuclei growth by attachment of colloidal and subcolloidal nuclei. The presence of non-autonomous phases makes clear the optical and other anomalies of pyrite unusual to cubic crystals. Such nano-sized phases are able not only to regulate the interactions between crystal and the growth media, and effect distribution of trace elements, but also support stability of non-equilibrium mineral parageneses.
Key words: pyrite, striation, non-autonomous phases, stacking faults, growth mechanism.
