The basaltoids frequently contain spherical or lens-shaped geodes filled with SiO 2 minerals (Verdier, 1971). Agates from Sidi Rahal are mainly gray-white or red-gray, with a red-orange or pink ...

Moving through the museum, you’ll encounter one of its most famous treasures: the Castle Lizzadro. This miniature golden ...

The Lizzadro Museum of Lapidary Art in Oak Brook, Illinois, is exactly that kind of hidden treasure. If you’re wondering what ...

Dimetrodons were mammal-like reptiles that preceded the dinosaurs. Rockhounding is the recreational study and collection of rocks, gems, minerals or fossils, such as fossilized remains of terrestrial ...

The geochemistry of agate and chalcedony in volcanic rocks represents an intricate record of silica precipitation and crystallisation processes occurring under variable thermal and chemical ...