Spider-Man jasper (also known as black brecciated jasper), has delicate red webbing throughout it's black color base. This material naturally fractures when cutting and polishing. This material is often found in the Pacific Northwest.
Jasper is a variety of quartz that may contain up to 20 percent foreign materials or inclusions, including organic material and mineral oxides, which determine the color, pattern and appearance of the stone.
Wash in warm soapy water. Can use a soft bristled tooth brush to clean.