sharing our knowledge.
Photographic gallery.  Thousands of particles under the microscope.

Sand By Type and Location

Sand is a large accumulation of small rock and/or mineral particles in the size range of from 20 micrometers to 2,000 micrometers in diameter (0.020 to 2.0 millimeters). Sand may include small shells or shell fragments and oolitic deposits. Sand is a size and density segregated material that is the result of air or water action.

Danube River, Pasau, Germany Danube River, Regensburg, Germany Inn River, Germany Baltic Sea, Germany Baltic Sea, Germany 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.)