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Blue Peruvian Opal naturally occurs with swirling patterns of deep blues
known for producing turquoise with strong color contrast and dramatic natural patterning
Blood Quartz is a clear to milky-white silicon dioxide mineral
its variations seem to depict landscapes and other images
Garnet was used as far back as the Bronze Age
Blue Hackmanite 10mm Round - 15-16 Inch ROUND Blue Peruvian Opal naturally occursDiscovered in Greenland in the late 1890's, hackmanite is named for Finnish geologist Victor Hackman. It is a rare occurrence to find gem grade hackmanite; at best, most crystals are translucent. Hackmanite is the light pink to pale violet variety of sodalite. It is a particularly unusual gem because it exhibits a special optical property known as "tenebrescence," a type of reversible photochromism. Hackmanite is very reactive under UV light.
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