Available in a few different sizes, these are specimens of distinctive Hyalite Opal.
It has an interesting glassy appearance - almost like someone has melted glass onto a matrix. Because of this, it is sometimes confused with glass, fake opal, or resin.
Our current stock is from the new find at San Luis Potosí and is some of the most gemmy Hyalite we've ever had in stock - more pictures are on the way shortly as this is seriously good quality stock.
Specimens from the find at San luis Potosí, Mexico, sold in an A and B grade and various sizes.
#7 - 22.3x19.65x13MM - a piece for those who like inclusions - it has some mossy looking inclusions, possibly chlorite. #10 - 30x25.6x25MM - a nice clear piece which does have some dirt/buildup and unfortunately some iron staining under the surface.
These pieces do have a strong fluorescence under UV light, which is what tends to be popular with the collectors of this type of Opal.
In some rare cases these specimens do exhibit play of colour, too. The main sources of this type of Opal are the eastern United States, and eastern Europe, with some exceptional quality pieces found in the Czech Republic.
Hyalite is sometimes also known as 'water Opal', 'jalite' and 'Mullers glass'.
The pictures you see here are representative of the products and are usually not the exact item you will receive. Where various grades are available we do try to photograph each grade - but some photographs are still on their way!