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These form as a criss cross banding called lamellae
The image shown has multiple cabochons to give you an idea of the range possibilites of the colors
Chrysocolla was first described by Theosphrastus
The most common members of the feldspar group are the plagioclase feldspars and the alkali feldspars
Ethiopian Opal was first discovered in Ethiopia in 1994
Hackmanite 6mm Round - 15-16 Inch Origin_Africa These form as a crissDiscovered 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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