Browse Items (164 total) Collection: Geology Browse All Browse by Tag Search Items of 17 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 Collection of miscellaneous pebbles of tans, browns, and grays. Tags: Brown, Geology, Gray, Rocks and Minerals, Tan Agate Collection of miscellaneous pebbles of tans, browns, and grays. Tags: Brown, Geology, Gray, Rocks and Minerals, Tan Agate Collection of miscellaneous pebbles of tans, browns, and grays. Tags: Brown, Geology, Gray, Rocks and Minerals, Tan Agate Collection of miscellaneous pebbles of tans, browns, and grays. Tags: Brown, Geology, Gray, Rocks and Minerals, Tan Agate Collection of miscellaneous pebbles of tans, browns, and grays. Tags: Brown, Geology, Gray, Rocks and Minerals, Tan Agate Two irregularly-shaped agate stones, all polished. Part of a polished stones collection. Tags: Geology, Rocks and Minerals Agate Three irregularly-shaped white to gray agate stones, all polished. Part of a polished stones collection. Tags: Geology, Rocks and Minerals of 17 Next Page Featured Item Crocodylomorph