Utah This rare fluorescent opal originates from an old mining claim in Utah which is now exhausted. The cabochons display a fabulous adularescent light play and nearly water clear transparency. Although hyalite can be found in some other locations only this Utah deposit produced gem quality adularescent material found in veins/seams thick enough to cut gemstones. The small deposits in Utah are depleted of gem cutting quality. Known in the mineral hobby as "satin flash" opal it is very difficult to find it cut into gemstones. One of the most fascinating qualities of the hyalite opals is its fluorescent green glow in shortwave ultraviolet light. All minerals can reflect a degree of light, but some have the physical qualities that allow them to temporarily absorb a small amount of light and releases it in a different wavelength. Hyalite opal is formed by hot spring geyser deposits and does not have color play like other opal, instead the light rolls off the internal bubble structure and flashes back at the onlooker. The present offering comprises an oval cabochon, weighing approximately 2.95 carats; together with an tear drop shaped cabochon, weighing approximately 12.22 carats and measuring 28.88 x 15.12 x 4.5mm. (2)
Utah This rare fluorescent opal originates from an old mining claim in Utah which is now exhausted. The cabochons display a fabulous adularescent light play and nearly water clear transparency. Although hyalite can be found in some other locations only this Utah deposit produced gem quality adularescent material found in veins/seams thick enough to cut gemstones. The small deposits in Utah are depleted of gem cutting quality. Known in the mineral hobby as "satin flash" opal it is very difficult to find it cut into gemstones. One of the most fascinating qualities of the hyalite opals is its fluorescent green glow in shortwave ultraviolet light. All minerals can reflect a degree of light, but some have the physical qualities that allow them to temporarily absorb a small amount of light and releases it in a different wavelength. Hyalite opal is formed by hot spring geyser deposits and does not have color play like other opal, instead the light rolls off the internal bubble structure and flashes back at the onlooker. The present offering comprises an oval cabochon, weighing approximately 2.95 carats; together with an tear drop shaped cabochon, weighing approximately 12.22 carats and measuring 28.88 x 15.12 x 4.5mm. (2)
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
