Why do the beaches in some areas have different coloured sand?

The color of the sand on beaches is in part determined by the type of rock that is the most plentiful in the coastal location. That is to say, whatever is near. In Hawaii there is black sand, green sand, fine white sand that's nearly like sugar in texture, broad coarsely ground tawny sand as well. All these types of sand are colored by their environment. Black sand is predominantly made up of volcanic cinder, as is Green sand. Green sand is predominantly composed of olivine, a green volcanic gl like stone.White sand and tawny sand are composed of shell matter, coral and sea rocks. The sand in New Brunswick may be colored by iron rich stone that have been broken down by ions of weathering.