| |
| | Rockhounds and rocks- DesertUSA |
 | | The rocks’ mineral concentrations condense or crystallize from fluids that entrain elements and invade crustal fractures and voids. |
 | | In the desert Southwest, good rocks and minerals those stony aristocrats that you might, as a rockhound, like to collect and display on your mantle or make into jewelry include, as a few examples, geodes, turquoise, quartz, fluorite, malachite, volcanic bombs, obsidian, fossils and, from beyond the earth, meteorites. |
 | | Geodes, among the most prized rocks for collectors, have a roughly spherical shape that typically spans several inches in diameter, and they have hollow interiors that come lined with crystals of several minerals, usually quartz of various colors. |
| www.desertusa.com /mag06/aug/rockhounds.html (2166 words) |
|