Pictures, links, and a brief description of the properties and applications of this siliceous rock.
| Salt (MRBloch Archive)
A collection of material relating to salt [NaCl] and its influence on civilization. Includes sections on physiology, geology, archeology, palaeoclimatology, palaeogeography, production, religion, economics, and etymiology of salt.
| ST Group, Inc.
Provides services to the mineral industry for geological services, training, project finance assistance, geophysical services and computer applications throughout the geological industry.
high-resolution pictures of rocks and minerals, taken from personal collections, as well as the Calvin College Geology Department, Michigan, USA.