Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F, OH)2. Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces.

Garnet, any member of a group of not unusual silicate minerals that have comparable crystal structures and chemical compositions. They may be colourless, black, and lots of sun shades of red and inexperienced.