A friend recommended a video showing impressive large quartz crystals. They were found in the Coleman Quartz Mine in Arksansas, USA. As far as I know these clear quartzes were formed by hydrothermal processes and are bound to large fault zones within Ordivician sandstones.

Watch these amazing videos:

Tags: Arkansas, Coleman Quartz Mine, Ordovizium, Quarz, Quarzkristalle, Sandstein, USA

This entry was posted Saturday, December 4th, 2010 at 9:56 pm under Mineralogy . You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.