This Specimen has been sold.
4" Polished Agate Bookends
This is a pair of gorgeous bookends made from a cut & polished agate nodule. There is a small cavity within each of the bookends, that's filled with a sparkling druze of quartz crystals.
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.
4" tall, 2.2" deep, 2.8" wide (each)