Knowledge of the early South American turquoise trade is scant and research is ongoing to determine specific sources of the stone. It appears that a village named Pueblo Hundido in the Cerro Del Indio Muerto mining district region is probably the source for much of the ancient turquoise found along the trade routes up & down the western coast of South America.
The rule of thought when it comes to gemstones is the only good inclusion is a nonexistent one. Except when it’s Rutilated Quartz! Within transparent quartz, the inclusions are usually needle-like rutile, but can also be clustered to resemble rosettes. The inclusions are titanium dioxide and are commonly golden, copper or red in color.
Tourmalinated quartz gets its name from the needle-like crystals of black tourmaline found within the quartz. Extremely high temperatures and pressure caused the two minerals to liquefy and mix together. Upon cooling the tourmaline crystalized within the gradually hardened quartz, forming the unique black needle inclusions. Most tourmalinated quartz is mined in Minas Gerais, Brazil, but can be found in many parts of the world.
What’s the big difference? Not a lot, as it turns out.
Agate and jasper are considered part of the chalcedony family, so think of them as the offspring of chalcedony. All three are classified as quartz.
Just as soon as you think you’ve seen Jay’s coolest Mine Finds, he comes up with another! If you enjoyed his trilobite necklace, then you’re in for another fossil treat. And not just any fossil either, but a red iridescent ammonite that positively shines!