Survey standard basalt BCR-1. U. S. Geological. Survey standard diabase W-l was used as a multi- element concentration standard to obtain sensitivity factors. It has been possible to determine 60 elements using graphite and silver blended rock mixtures as electrodes at several magnetsettings and exposure sequences. read more
Basalt is a common extrusive igneous rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. Flood basalt describes the formation in a series of lava basalt flows. read more