Boron is a solid black or silvery-gray color. Crystal boron has a black color, is second in hardness only to diamond, and a relatively fragile texture. Purity95,Particle size: 0.08-5um About Boron Amorphous Boron: The powder of Boron is black or dark brown in color. It can react at room temperature with fluorine, and it will not be corroded when used in aqueous hydrofluoric and alkali solutions. Boron is also known as amorphous ore. Boron has high volume and mass calorific values. The