Rocks BIG BEND NATIONAL PARK - Texas A&M University Rocks, Minerals, and Precious Stones ROCKS AND MINERALS -Version 3 - William Paterson University GEOMAN'S ROCK & MINERAL CHARTS NATURAL STONE BY CLASSIFICATION - graniteland.com ROCKS: IGNEOUS, METAMORPHIC, and SEDIMENTARY - Geology.com Rocks and Minerals(US National Park Service)
