Although most of the jewellery components bearing this name are the glass variety, there is also a true gemstone called “opalite”. This stone is composed of dolomite plus quartz and fluorite, and is usually a purple, lavender, or mauve colour. It sort of looks like a cross between lepidolite and charoite. You may see this gemstone also called “opal fluorite” or “tiffany stone”.
Most of the time, in the handcrafted jewellery world, the word “opalite” refers to the luminous blue, man made “sea opal glass”.