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What are thundereggs? The rare, chalcedony-filled rocks
They are nodule-like rocks typically found in volcanic regions ... of human hands to fully appreciate their beauty. When cut and polished, thundereggs reveal a stunning array of colors and ...
Live Science on MSN2d
30,000-year-old fossilized vulture feathers 'nothing like what we usually see' preserved in volcanic ash
"Fossil feathers are usually preserved in ancient mudrocks laid down in lakes or lagoons. The fossil vulture is preserved in ...
PBS6y
Anatomy of Nyiragongo
Tephra is a general term for fragments of volcanic rock and lava that are blasted into the air by explosions or carried upward by hot gases. Tephra includes large, dense chunks, light rock debris ...
akm1mon
TPU scientists are investigating how secondary minerals in volcanic rocks affect their properties and oil and gas potential
Scientists from the Tomsk Polytechnic University School of Natural Resources Engineering have studied secondary minerals – carbonates and zeolites – of volcanic rocks from the sites of the North ...