Crushed Black Kyanite Blades from Brazil, Medium Crush (0.25mm-2mm in Width, 0.1cm-1.5cm in Length)

Kyanite is a fibrous metamorphic mineral that forms in distinctive thin blades and can come in a variety of colors, though the most common is blue. This mineral only forms under high pressure within the Earth's crust, which can tell you A LOT about the tectonic history of an area. Because kyanite crystallizes as thin blades, it also crushes up into progressively smaller, elongate crystals during the crushing process. This black kyanite is from Brazil and is a great choice for your unique crystal projects. Our medium material is considered to be sand sized (very coarse sand to fine sand), with the width of the kyanite blades, ranging between 2 millimeters to 0.25 millimeters. The average length of the kyanite blades range between 0.1 centimeters to 1.5 centimeters. Please see the corresponding sediment size chart.  Mineral Properties Mohs’s Hardness: 4.5 and 7 (dependent on crystal orientation) Specific Gravity (g/cm3): 3.5 - 3.7 Luster: Vitreous, Pearly Color: Black Origin: Brazil