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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 Connecticut – What Rocks You Can Find and Where
Explore Rockhounding in Connecticut
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,…