Awesome Large Hyalite Opal From Mexico Fluorescent Gem Stone M21




Item History & Price

Information:
Reference Number: Avaluer:16008738Country/Region of Manufacture: Mexico
Original Description:
Up for sale is an awesome hyalite opal specimen from San Luis Potosi, Mexico! The specimen is in good shape. It weighs approximately 112 grams. Pictures were taken dry indoors (UV picture was taken with an 11 watt shortwave UV lamp).
Hyalite opal (Opal-AN) is a clear variety of opal, different from most other opal varieties. It is almost always fluorescent (bright green in shortwave UV) and has a strong vitreous luster. The opals from San Luis Potosi formed underground as a result o...f precipitation of silica from a vapor phase. It is rare to see large examples of hyalite and it usually occurs as a ~1 mm coating on agates, chalcedony, or other opals. Hyalite typically contains less water than other opal varieties; usually around 3 to 8%. Orange webbing in hyalite opal is caused by iron, and is extremely rare outside of San Luis Potosi, Mexico.
Please note that you will need a shortwave UV blacklight to see the fluorescence! Regular blacklights and longwave lamps will cause little to no response. Around 90% of fluorescent minerals fluoresce in shortwave UV, while the others are longwave UV fluorescent.
If you have any questions, feel free to ask and I will respond as soon as possible. Also, please check out my other listings!



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