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

🌋🪨⚫🔪

#obsidian #volcanic glass #sharp rock #conchoidal fracture #glassy texture #black glass #natural glass

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#crisp ribbon #stiff fabric #organza ribbon #decorative textile #شريط اورجانزا #gift wrap accessory #structured sheer #glassy texture

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#glassy texture #vitric texture #petrology #rock analysis #mineralogy #hyaline #rock microstructure