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Tourmaline is characteristically a mineral of granites, granite pegmatites, and pneumatolytic veins. It also occurs in some metasomatic and metamorphic rocks and as a detrital mineral in sediments.Tourmaline has the property of emitting far infrared rays and releasing negativeions.
The far infrared emission properties of tourmaline superfine powders increase with the decrease of tourmaline particle size. Tourmaline emits far infrared radiation in the 4-14 micron wavelength.