Fire opal does not opalesce and is usually milky and turbid.
The best qualities are clear and transparent.
They are very sensitive to every stress. Important deposits are in Mexico.
Girasol “Sunflower” is nearly colorless, transparent variety with slight bluish sheen and red play of color.
A name sometimes given to girasol or fire opal is sun opal.
Mexican Water Opal is a variety from Mexico, is colorless or slightly brown, transparent and with unicolored schiller

*Info by Walter Schumann “Gemstones of the World”