Replying to @kingKongSchlong today we are talking about obsidian. Obsidian is volcanic glass that cooled quickly at/above the Earth’s surface. Due to its amorphous structure on an atomic level, it appears shiny or glassy and breaks with conchoidal fractures. This specific sample of obsidian is actually super cool because it has porphyritic quartz phenotypes within it! - #obsidian #geology #igmetpet #igneous #volcano #rocks #geologymajor #earth #science #womeninstem #conchoidalfracture @Taylor Sw