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View of blue microcline feldspar crystals

View of blue microcline feldspar crystals

E425/0608

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Credit

E.R.DEGGINGER / SCIENCE PHOTO LIBRARY E.R.DEGGINGER / SCIENCE PHOTO LIBRARY

Caption

Amazon stone. View of the blue variety of microcline feldspar crystals known as amazon stone. Feldspar is the most common mineral in the Earth's crust. It is found in igneous and metamorphic rocks. The feldspar series ranges from those containing pure potassium to those with pure sodium along with aluminium, silicon and oxygen. Microcline feldspar contains pure potassium along with aluminium, silicon and oxygen. The microcline form can be used for porcelain and glass manufacture. Amazon stone is valued as a gemstone when highly polished. This specimen is from Crystal Peak, Colorado, USA,.

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