Article

National Capital Area Natural History - Geology

Geological Collections

Geological specimens include rocks, minerals, surface process samples, and soils. These specimens document the presence of geological materials, their mineral composition, structure and texture, and the processes that created them.

Rocks and Minerals

Mineral and rock collections from Rock Creek Park and Chesapeake and Ohio Canal National Historical Park include aplite (quartz and feldspar), galena, lead sulfide, gold, garnet, mica schist, ilmenite (a titanium-iron oxide mineral that is weakly magnetic), hematite (iron(III) oxide), quartz, rose quartz, and granite.