igneous
Red scoria (vesicular volcanic rock)
Scoria, typically basaltic to andesitic volcanic rock
AI-generated identification · may be incorrectSmall, rounded reddish-brown piece with numerous vesicles; likely mostly plagioclase and pyroxene with iron-rich volcanic glass/oxides. Scoria is commonly Mohs 5–6, dull to slightly glassy, and has no consistent cleavage; this piece’s exact composition cannot be confirmed visually.
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Physical properties
Small, rounded reddish-brown piece with numerous vesicles; likely mostly plagioclase and pyroxene with iron-rich volcanic glass/oxides. Scoria is commonly Mohs 5–6, dull to slightly glassy, and has no consistent cleavage; this piece’s exact composition cannot be confirmed visually.
Formation & geological history
Forms when gas-rich lava cools rapidly at or near the surface, trapping bubbles; its age depends on the source eruption and cannot be determined from the image.
Uses & applications
Used as lightweight landscaping aggregate, drainage material, and sometimes in construction; small specimens may be kept as curiosities.
Geological facts
Its holes are gas bubbles preserved as the lava solidified; red coloration commonly results from oxidation of iron during or after cooling.
Field identification & locations
The porous texture, low apparent density, and rusty-red color suggest scoria, though a fired or manufactured porous material can look similar. Scoria occurs around basaltic volcanic fields worldwide.
