Black Tourmaline Powder (Large Volume)
Category: Industrial Jewelry Products
Tourmaline,chemistry type: Nar3Al6[Si6O18][BO3]3(OH, F)4,have piezoelectricity and thermo-electricity.Infrared ray emissive more than 90%,anion 25000-35400/cm3 of releasing.
Physical Items:
(1) den...