Shape: round flat plain

material: natural black agate

specification: 2mm 3mm 4mm

black agate the main component is SiO 2 (silica), which is gray when the texture is very pure. If it contains various pigment ions, it will present various colors such as red, black, blue and green, and has a deep or shallow girdle structure. These bands can have different colors (red, blue, purple, green, black, white, etc.). If they are black and white, they are called Onyx black agate. Those with red and white stripes are called filament black agate. If the black strip in the black agate is very wide, it can be cut separately and processed into black agate beads. It is inevitable that there are still very thin white bands, which can be seen in the sun. Therefore, it is normal to see white tiny stripes in black agate beads.