Sand from Calvert Cliffs State Park, MD. Featuring ilmenite, quartz, garnet, magentite, rutile, and zircon.

The petri dish is 9 cm in diameter.

Sample provided by Siim Sepp of sandatlas.org.

Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro rig, as seen here:

gigamacro.com/gigapixel-macro-imaging-system /