Baltic Sea Sand at Tallinn, Estonia
                This sand is primarily quartz grains about 100 micrometers
                  in diameter. These grains have been separated from the bulk
                  sand using LST (Lithium heteropolytungstate) and mounted in Melt Mount, 1.704
                  refractive index.
              
              
                Transmitted Single Polarizer Oriented Perpendicular to Length.
                
Definition/Function:
                Significance in the Environment:
                Characteristic Features:
                these grains are pink and have a refractive index well below 1.704. They are strongly
                pleochroic, pink to very dark green.
                Associated Particles:
                References:
                Greenberg, Gary, A GRAIN OF SAND: NATURE'S SECRET WONDER, Voyageur Press, 2008.
                
                Welland, Michael, SAND: THE NEVER ENDING STORY, University of California Press, 2009.
                
                http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artjun01/clsand.html
                
(Good Information on the microscopy of sand, Great site for more information on
                microscopy in general)
                
                http://www.scientificamerican.com/article.cfm?id=a-grain-of-sand-natures-secret-wonder
                
(Good Information on Sand with links to more information on sand)
                
                http://www.sciencelive.org/component/option,com_mediadb/task,play/idstr,Open-feeds_fsc_exploring_sedimentary_processes_fsc02_02_m4v/vv,-2/Itemid,97
                
(Brief, very informative video on what can be learned from the shape of a sand
                grain.)