![]() ![]() ![]() He has a PhD in geology and is a GIA graduate gemologist. King has decades of rock tumbling experience and writes most of the articles on. In the case of ocean jasper, ultraviolet light, which people can not see, causes some of the orbs and banding to emit light with a wavelength that is visible to humans.Īn interesting article about Ocean Jasper titled: Madagascar's Ocean Jasper - A Lost Treasure Found Again was published on the Yahoo Voices website in July, 2008. However, some materials emit light in the human-visible range when they are illuminated with ultraviolet. Most materials illuminated with ultraviolet light appear black because ultraviolet light is not within the visible spectrum of the human eye. The middle photo was taken with long wave ultraviolet light shining on the jasper. Some of the matrix can be transparent or jelly-like.įluorescent minerals have the ability to emit light while they are illuminated by light from another source.įor the jasper in the photos at right, the top photo was taken with normal light. With a close examination you will see that the orbs are generally translucent with fine banding. Ocean jasper isn't a true "jasper" because much of the material is translucent. Artistic lapidaries can use these to an advantage rather than hiding them as a defect. Ocean jasper has occasional small voids, which are often lined with drusy quartz. It makes beautiful tumbled stones and the material is also prized by people who produce cabochons, spheres and other small polished items. The wonderful colors and interesting orbs are what make ocean jasper such a popular stone. The orbs usually have many concentric bands that vary slightly or distinctly in color. The orbicular pattern is produced by small spheres in the material that appear as small circles or eyes on broken, cut or polished surfaces. Its characteristic appearance is colorful orbicular markings on a green, brown, yellow, cream, red or pink background. ![]() Ocean jasper is a trade name given to a silicified rhyolite produced along the northwest coast of Madagascar. ![]()
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