Unlike regular glazed ceramic tiles, glass tiles require a little bit of a different procedure for grouting.
Crack-free, color-matched grout for a tile backsplash - Fine Homebuilding
The grout in the corners of my shower is cracking. Can I just cover it with silicone cauk or do I need to replace the grout then caulk? : r/Tile
Grouting Glass Tile - Fine Homebuilding
Grouting Natural Stone - Fine Homebuilding
Is $2000 for labor only on this tile job too much? : r/Homebuilding
Starlike Crystal Evo 700 5.5 lb. Translucent Glass Tile Grout
A master tile-setter unveils his craft to those wishing to try their hands at tiling. He guides the reader through theory into practice with a series of projects for floors, walls and worktops. For each one, he demonstrates the traditional, thick mortar-bed setting and the new, thinset technique.
Setting Tile [Book]
Am I being overly picky with my contractors grout lines? : r/Tile
Working With Glass Tile