شهاب سنگ قمری

توضیحات :

شهاب سنگ قمری basalt ...
Properties
Composition
Plagioclase , Pyroxene Group , Olivine Group
Silica (SiO2) Content
45%-52%

Composition
By definition, basalt is an aphanitic (fine-grained) igneous rock with generally 45–53% silica (SiO2) and less than 10% feldspathoid by volume, and where at least 65% of the rock is feldspar in the form of plagioclase. This is as per definition of the International Union of Geological Sciences (IUGS) classification scheme. It is the most common volcanic type Earth.