Both are types of rocks.
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Obsidian has a higher luster(shinier) than coal, coal is organic, and coal is sedimentary and obsidian is igneous
Obsidian and coal are both rocks and they are formed by lava
flint has an extremely bright shine
nothing
Both are glassy and both are black
No. One seldom finds obsidian in a coal mine.
Synonyms for obsidian are brunet, charcoal, coal, ebony, pitch, raven, slate, sable, clouded, dusky, and somber. Antonyms for obsidian are white and clean.
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obsidian is smooth but not basalt
They're both fossil fuels, and they're often burned for energy.
Pumice is formed from frothy lava. Obsidian is not. Both have cooled rapidly from lava.
Basalt and obsidian are extrusive igneous rocks. Gabbro is an intrusive igneous rock.