light-colored, silica-rich igneous rock that is less dense than basaltic rock. dense, dark-colored igneous rock formed from magma;rich in magnesium and iron and poor in silica. Describes magma or igneous rock that is rich in feldspars and silica and that is generally light in color.
The compound name for H3S5 is hydrosulfide sulfanide sulfide
Lots of substances. Rocks, metals, minerals, you name it.
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