Abstract
<title>Abstract</title> <p>This study presents the structure and properties of the muscovite mica natural powder that was melted by plasma jet and collected as solidified microspheres after rapid cooling in air. The heating of mica material in plasma induces its dehydroxylation, i.e. the removal of the structurally bound water. The pore size distribution curves reveal that the plasma-spheroidized powder contained ultrafine pores, whereas the natural mica powder contained predominantly coarser pores. Flowability characteristics of natural mica powder were substantially improved after plasma spheroidization. The amorphous component strongly prevailed in the plasma spheroidized mica powder. The monitoring of chemical changes in powder was discussed in a common manner, i.e. element concentrations expressed as simple oxides contents. We saw a trend matching the content of each oxide with its melting point.</p>