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What makes volcanic rocks black?

Answer

The dark color of mafic igneous rocks is attributed to dark minerals like biotite mica, olivine, pyroxene, and iron and magnesium. Felsic igneous rocks are lighter in color.
Q&A Related to "What makes volcanic rocks black?"
1. Roll the clay around in your hand to soften it. Shape it like a typical rock or any other form you like. 2. Pour a small amount of salt onto the table and roll the shaped polymer
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Obsidian.
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( väl′kan·ik ′räk ) (geology) Finely crystalline or glassy igneous rock resulting from volcanic activity at or near the surface of the earth. Also known
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