Paragenetic consideration and mode of occurrence of minerals indicate frequently that the minerals precipitated from fluids. The determination of chemical composition and crystal structure is focused on the main element concentration. Genetic discussions based on a large number of trace elements, which are determined by instrumental analytics. Thereby we can notice that date about H2, hydro carbons, CO, CO2, N2, HF, HCl, O2, sulphur-species are rare.
Gas release profiles reflect differences of volatiles release temperatures. The degassing experiments were carried out using a special high-vacuum-hot-extraction method (DEGAS) in combination with a quadrupol mass spectrometer. The gaseous species were analyzed in multiple ion detection mode for a number of volatile species as hydrogen, carbon-species, nitrogen, sulphur-species, oxygen, but also boron-species or sodium.
The decomposition of charoite (K(Ca,Na)2Si4O10(OH,F)H2O is presented as exemplification.
In addition to the water release in two separate temperature ranges was observed a fluorine release above 1270°C. Furthermore should be relevant for crystalline structure the CO2-release between 600 and 1000°C. A decomposition of carbonates from admixtures can be excluding definitely.