Turquoise is a relatively soft gemstone, and can be easily scratched and broken. This porous opaque stone is easily discolored by oil and pigments, and changes color when it loses some of its water content. A sky blue shade in turquoise is due to the presence of copper, while iron gives it a greener tone.
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Posted on July 18, 2015 in Health. Your treadmill workouts should last between 30 and 60 minutes per workout. The optimal workout schedule including treadmill exercise would be around four days a week on the treadmill, with off-days including weight-bearing or âresistance exerciseâ two or three of the other days.