HYALITE OPAL SPECIMEN FROM NSW AUSTRALIA 87.75 CTS [VS1252]

HYALITE OPAL

HYALITE is a clear variety of Opal that forms globules or clusters of globules becoming botryoidal[it resembles a bunch of grapes.] This specimen was found in the flat top mountains near Dalby nsw Australia.You can see the volcanic formations and the rhyolite rock its on.These Hyalite  specimens  fluoresces green

Weight 87.75 cts app

Size 25 x 23 x 20 mm app

This is a special type of opal which is often classified with common opal. Hyalite is, however, a very distinctive material. It is always colourless and glass clear, and contains less water than other forms of opal. Its water content is usually of the order of 3-4%. Hyalite is most commonly found in association with volcanic rocks, especially in small cavities, or vugs. It may also be found coating secondary minerals in the weathering zone of ore deposits.