Rockhounding in Tennessee – What Rocks You Can Find and Where
Upcoming Rockhounding Events in Tennessee Pearl Streak: White Hardness: 3 Chemical Formula: CaCO3 Pearls are an organic mineral formed inside a mollusk. The mollusk takes aragonite, the same mineral that makes up its shell, and builds up concentric layers around any foreign particle that enters the mollusk’s mantle. Pearls vary widely in color and shape,…
Rockhounding in Idaho – What Rocks You Can Find and Where
Upcoming Rockhounding Events in Idaho Opal Streak: White Hardness: 5 – 6 Chemical Formula: SiO₂·nH₂O Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks and voids , caused by natural faults or decomposing…
Rockhounding in South Dakota – What Rocks You Can Find and Where
Upcoming Rockhounding Events in South Dakota Explore Rockhounding in South Dakota
Rockhounding in Mississippi – What Rocks You Can Find and Where
Upcoming Rockhounding Events in Mississippi Explore Rockhounding in Mississippi
Rockhounding in Iowa – What Rocks You Can Find and Where
Exploring the Rocks of Iowa Iowas landscape varies widely from place to place across the state. A state shape by glaciers, rivers, and seas during its geologic past has lead to a variety of minerals to be found in Iowa. Upcoming Rockhounding Events in Iowa Agate Streak: White Hardness: 7 Chemical Formula: SiO2 Agate is…
Rockhounding in Ohio – What Rocks You Can Find and Where
Exploring Ohio Geology Upcoming Rockhounding Events in Ohio
Rockhounding in Illinois – What Rocks You Can Find and Where
Exploring the Rocks of Illinois Even though Illinois does not have any mountain ranges or deep canyons, the geology of the state has many complexities. Known as the Prairie State, at first glance it seems an unlikely place to collect rock and mineral specimens. The rich prairies across Illinois are themselves derived from ancient rocks,…
