Fer information and grins. Obsidian is differant from flint. obsidian is made a type of glass made from a volcanic activity. True flint is found in chalk bedswhich were formed during the Cretaceous period. It will come in a nodular form in colors generally ranging from black,grey and sometimes brown in color also.,and is made up of about 99 percent quartz.. These chalk beds are found in europe in the area of England,Denmark and severl other locations. In the U.S.,the closest thing to true flint is foiund in the chalk beds of the AUSTIN LIMESTONe deposits in texas. Obsidian is volcanic glass,and most variaties are transpucent to some degree. As a point of interest,this material will fracture on the molecular level,making a blade that is a thousand times sharper that the sharpest razor blade. It also was used as a scalpel material during the first heart transplants,and in other heart surgeries due to that sharpness. The English is such a fine material that it has a greater life for sparking that a lot of the none english flint materials . Obsidian also does not have any grain.. to it or chrystalline stucture,making it not a true mineral. This is why it fractures with so sharp an edge. hope that helps. Also,before I forget,the other cherts,and and materials that we sometimes think as flint from this area the U.S. is made up of only 90 percent quartz,while true flint is about 99 percent quartsz. :roll: :roll: King