Keywords: Sand from Punaluu, Hawaii, US.jpg Obsidian sand from Punaluu Black Sand Beach island of Hawai ™i Magnification The grains are 0 5 to 1 mm in size Made with Canon A40 PowerShot digital camera and Novex AP8 microscope by Renée Janssen 2006-06-09 own assumed Renee1137~commonswiki Close-ups of sand Punaluu Black Sand Beach |