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Its formula is Cu6Si6O18·6H2O (also reported as CuSiO2(OH)2)
forms in tHesse unique barrel shapes that can resemble cacti
Purpurite contains magnesium and iron and is actually the same elements that give amethyst is purple color minus the silica which is what makes quartz and many other gemstones hard
almost like glass
Color Changing Fluorite Tourmaline Its formula is Cu6Si6O18·6H2O (alsoColor Changing Fluorite from the Rogerley Mine, U. K. Will be intuitively selected for you out of this lot in the photograph. These pieces are green and as soon as they touch the sunlight, have reflective bits of blue hues throughout.
