GO:0070150:   mitochondrial glycyl-tRNA aminoacylation
The process of coupling glycine to glycyl-tRNA in a mitochondrion, catalyzed by glycyl-tRNA synthetase. In tRNA aminoacylation, the amino acid is first activated by linkage to AMP and then transferred to either the 2"- or the 3"-hydroxyl group of the 3"-adenosine residue of the tRNA.