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#obsidian #volcanic glass #glassy texture #extrusive rock #felsic rock #conchoidal fracture

🌋➡️🪨

#lava flow #rock formation #extrusive rock #cooling lava #volcanic process #solidification

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#lava flow #geological extrusion #extrusive rock #natural extrusion

🌋🪨⬛

#basalt #volcanic rock #igneous rock #lava rock #black stone #extrusive rock

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#pumice #vesicular rock #porous rock #lightweight rock #floating rock #gas bubbles #extrusive rock