For minerals, the angle of this name is usually measured between the vibration and cleavage directions.
For minerals, the angle of this name is usually measured between the vibration and cleavage directions. In astronomy, interstellar reddening results from this combination of absorption and scattering due to dust grains. One event of this type was found to be associated with microtektites and shocked quartz, and may have seen the formation of the Chicxulub crater. Luis and Walter Alvarez showed that that event also produced a global iridium-rich layer. The Permian-Triassic and K-T boundaries are associated with, FTP, this type of event that sees a sudden, massive reduction in biodiversity.
For minerals, the angle of this name is usually measured between the vibration and cleavage directions.
{extinction}