8.3" Polished Crazy Lace Rosetta Stone - Mexico
This is a gorgeous polished, freestanding section of crazy lace rosetta stone, also known as rosetta jasper. This specimen was collected, sculpted and polished in Chihuahua, Mexico. The colors vary throughout this specimen, ranging between pink, red, peach and white. It is a mix of quartz crystals, jasper and agate, hence the use of "stone" in the name. This base of this specimen has been left rough and flat for presentation purposes.
Jasper is a term that can be applied to an opaque variety of chalcedony (light does not pass through it) The opaqueness is due to a much larger amount of impurities mixed with silica/quartz. Like agate it may form in a huge variety of colors, and is often multi-colored. In most cases, jasper will occur when silica-rich fluids permeate throughout a soft sediment or volcanic debris deposit. The fluids then crystallize around the particles/impurities, resulting in a cementation process. Most often, the impurities present determine the coloration of the deposit following solidification, however other factors can play a role in the color of what is now considered a jasper.
Agate is a variety of microcrystalline quartz that displays translucence and in some cases banding. Agate primarily forms when silica-rich fluids fill pockets within rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.
Crazy lace agate, also known as Mexican Agate is a unique banded agate that comes from Chihuahua Mexico. It gets its name from complex, lacy patterns swirling through the stone. Colors can vary from creme to orange, to red colorations and are due to iron and aluminum inclusions in the agate.
Silicon Dioxide, also know as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.