mineral
Amazonite
Microcline (Potassium Feldspar) - KAlSi3O8
Hardness of 6 on the Mohs scale; color is distinct bright turquoise-green to blue-green; vitreous to pearly luster; triclinic crystal system; good cleavage in two directions at nearly right angles; specific gravity around 2.56-2.58.
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Physical properties
Hardness of 6 on the Mohs scale; color is distinct bright turquoise-green to blue-green; vitreous to pearly luster; triclinic crystal system; good cleavage in two directions at nearly right angles; specific gravity around 2.56-2.58.
Formation & geological history
Forms primarily in pegmatites and granitic rocks through slow-cooling magma rich in potassium, aluminum, and water, often with trace amounts of lead and water imparting the greenish color.
Uses & applications
Used extensively as an ornamental stone, for making cabochons, beads, carved decorative items, and by mineral collectors.
Geological facts
The green color was long thought to be caused by copper, but modern studies show it is due to trace amounts of lead and water trapped in the crystal lattice.
Field identification & locations
Identified easily by its unique grid-like twinning pattern (tartan twinning) under a microscope and its distinct blue-green color. Found in Russia, the United States (such as Colorado), Brazil, and Madagascar.
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral