Crushed Black Tourmaline Powder from Brazil, Fine Crush (<0.25mm)

Tourmaline represents a large group of related mineral species that exhibit many unusual optical and physical properties. Chemically more complex than most minerals, tourmaline exhibits a substantial range of colors and varieties. This particular black tourmaline is from Brazil and has a nice shiny appearance even when crushed. Tourmaline is also one of the official birthstones for October. Our powdered material consists of mostly silt and clay sized particles. Our powders do have a slight grit to them. Please see the corresponding sediment size chart.  Mineral Properties Mohs’s Hardness: 7 - 7.5 Specific Gravity (g/cm3): 3.00 - 3.26 Luster: Vitreous Color: Black Origin: Brazil This product is not man-made, mixed with resin, dyed, or stabilized. Pictures are taken in full sun and material is dry. Size measurements are using the metric system (millimeters).