Crushed Black Tourmaline Sand from Brazil, Medium Sand (0.25mm-2mm)

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 medium material is considered to be sand sized (very coarse sand to fine sand), ranging between 2 millimeters to 0.25 millimeters. 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), including the metric ruler (cm/mm) as shown in the product photos.