This Specimen has been sold.
5.3" Spessartine Garnets & Quartz - China
Here is a beautiful 5.3" spessartine garnet & quartz association on a matrix, collected from China. Although there are damages to the garnets, the specimen is in overall great shape and displays nicely on a flat surface. Also, small metallic octahedrals can be found protruding from between the quartz encrusted matrix. These octahedrals are likely galena.
Garnets are nesosilicates having the general formula X3Y2(SiO4)3. There are many species of garnet which include pyrope, almandine, spessartine, uvarovite, andradite and grossular (varieties of which are hessonite, cinnamon-stone and tsavorite). Garnets are found in a wide variety of colors including red, orange, yellow, green, purple, brown, blue, black, pink, and colorless, with reddish shades being the most common.
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.