4.03" Dolomite & Pyrite Specimen - China

 
 
Here is a sharp 3.81" matrix of Dolomite & Quartz from Hunan Province, China. Well-terminated, light pinkish dolomite crystals sit on a shiny metallic mass of hundreds of tiny pyrite cubes. There are a few tiny quartz points present as well. The specimen sits naturally several ways to make for a beautiful display.

Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate—CaMg(CO3)2.

The mineral dolomite crystallizes in the trigonal-rhombohedral system. It forms white, tan, gray, or pink crystals. Dolomite is a double carbonate, having an alternating structural arrangement of calcium and magnesium ions. It does not rapidly dissolve in dilute hydrochloric acid as calcite does. Crystal twinning is common.

The mineral dolomite was first described by Carl Linnaeus in 1768 and In 1791, it was described as a rock by the French naturalist and geologist Déodat Gratet de Dolomieu who first recognized the material in buildings of the old city of Rome, and later as samples collected in the mountains known as the Dolomite Alps of northern Italy.


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.
DETAILS
SPECIES
Dolomite & Pyrite
LOCATION
Hunan Province, China
SIZE
4.03x2.03x2.02"
CATEGORY
ITEM
#32680