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 with the general formula X3Y2(SiO4)3. Garnets come in many species, including pyrope, almandine (the most common species), 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, though reddish shades are the most common.

Quartz is the name given to silicon dioxide (SiO2) and is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich environments--usually igneous rocks or hydrothermal environments like geothermal waters--at temperatures between 100°C and 450°C, and usually under very high pressure. In either case, crystals will precipitate as temperatures cool, just as ice gradually forms when water freezes. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountain formation: these veins can be hundreds of millions of years old.

Spessartine Garnet & Quartz
5.3" long, 2.3" wide