Browse Items (522 total) Tags: North America Browse All Browse by Tag Search Items of 53 Next Page Sort by: Title Creator Date Added Actinolite Dark green mass of radiating columnal aggregates of actinolite crystals in a quartz matrix. Tags: California, Geology, North America, Rocks and Minerals, United States Actinolite One specimen of green, radiating, columnar, aggregate crystals of actinolite. Tags: Geology, Massachusetts, North America, Rocks and Minerals, United States Agate Small, cut and polished piece of a banded light to dark gray and light reddish-brown agate. Tags: Brown, Colorado, Geology, Gray, North America, Red, Rocks and Minerals, United States Agate, Dendritic One specimen of light reddish-brown agate with numerous patches of black dendrites. Tags: Geology, Kansas, North America, Rocks and Minerals, United States Algae Algae fossil Tags: Brown, Fossils, Geology, Gray, Kansas, North America, Pennsylvanian, Plants, United States, Yellow Algae Algae fossil. Tags: Fossils, Geology, Gray, Mississippian, Missouri, North America, Plants, United States Alligator, American Tags: Animals, North America, Reptiles, United States, Zoology Alligator, American Tags: Animals, North America, Reptiles, United States, Zoology Alligator, American Tags: Animals, North America, Reptiles, United States, Zoology Amethyst Large specimen of dark purple amethyst quartz crystals. Tags: Canada, Geology, North America, Ontario, Purple, Rocks and Minerals of 53 Next Page Featured Item Pigeon, Passenger