1.5" Galena Crystal with Druzy Quartz - Rogerley Mine, England
Here is a 1.5" wide galena crystal that's encrusted in a thin layer of quartz, collected from the famed Rogerley Mine in County Durham, England.
The Rogerley Mine is located in the historic Weardale mining District of Northern England. First discovered in the early 1970's, the Rogerley Mine is the only mine in all of Britain to be worked on a commercial scale in the name of collecting crystallized mineral specimens. Since the summer of 1999, UK Mining Ventures has operated the Rogerley Mine on a seasonal basis, producing many fine, well crystallized specimens of green fluorite. The Rogerley is considered some of the finest fluorites in the world and much of it has incredible fluorescence.
Galena is a lead based mineral that is in fact the primary ore of lead, and has been used for its lead content for thousands of years. Galena typically displays a gray metallic luster and forms cubes or octahedral crystals. The chemical composition of galena is PbS.
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.