This Specimen has been sold.
2.4" Brookite and Chlorite Quartz - Pakistan
This specimen displays chlorite included quartz crystals that formed in association with three brookite crystals.. The quartz crystals have green chlorite inclusions throughout. The base of the matrix has been cut flat, allowing fora aesthetic presentation of this crystal association without the need for a display stand.
Brookite is one of the five forms of titanium dioxide found in nature and forms almost always in association with another mineral, frequently with quartz. This small unique crystal is typically microscopic, though is known to grow larger in some locations. Pakistan tends to be the location where some of the most beautiful and vibrant brookite specimens come out of, for the crystals are a brown-orange translucent color, forming flat chip like projections out of matrix. In some rare cases, just the sim card-like crystals have been found intact, separated from a matrix on their own, these specimens are called "floaters".
Silicon Dioxide, also known 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.