Identification and significance of accessory minerals from a bituminous coal

摘要: Abstract A scanning electron microscope (SEM) has been used to study the in situ accessory minerals polished blocks and pellets of petrographically analysed samples Waynesburg coal (hvb). Individual grains from low-temperature ash (LTA) same were also studied. The visual resolution SEM permitted detection submicron mineral grains, which could then be by attached energy-dispersive system. Emphasis was placed on highly reflective carbominerite bands. Among most abundant observed rutile, zircon, rare-earth-bearing minerals. Small (1–5 μm) particles what may authigenic iron-rich chromite a nickel silicate form rims quartz grains. permits observation grain morphology intergrowths. These data are useful determining authigenicity diagenic alteration. Substances density splits LTA include authigenic, detrital, extraterrestrial magnetite, tourmaline, evaporite (?) minerals, fluorine-bearing amphibole. This analytical approach allows determination specific sites for many trace elements coals. In coal, chromium is iron-chromium rims, fluorine amphibole, rare-earth ability relate trace-element will aid predicting behaviour during combustion, liquefaction, gasification, weathering, leaching processes. insight into degree mobility these provides clues sedimentological diagenetic conditions.