Labels:door | hakham | person | rock | sculpture | sky | toothbrush | tree | windowpane OCR: Test your knowledge Answer Quartz The answer is Quartz Quartz the hardest known non-gem material in the world. When granite cools pup Isolidifies, Quarfz con tained within the matrix with other minerals. How ever granite *, only composed of 20- -35% of the entire matrix. solidifies withir
