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Unusual ‘Lava Eggs’ Appear by Volcano

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A geologist looks at Iceland’s newest eruption and sees something that looks a lot like a nest of stone eggs.

Footage circulating out of Iceland’s Reykjanes Peninsula shows an odd sight along the edge of an active lava flow: smooth, rounded, egg-shaped rock formations sitting right where molten basalt meets open air. Inside Edition picked up the clip in June 2021, and it quickly drew attention for looking less like typical hardened lava and more like a clutch of oversized stone eggs laid out along the flow front.

• The formations appeared along an active lava flow from the Fagradalsfjall eruption on Iceland’s Reykjanes Peninsula, which began in March 2021.
• Geologist Matthew Thirlwall of Royal Holloway, University of London, identified the shapes as pahoehoe lobes and explained the process to Reuters.
• Thirlwall said the lobes form because the flow is fed “from inside,” with internal pressure breaking up and pushing apart the bulbous rock into distinct egg-like shapes.

The Eruption Behind the Footage

Fagradalsfjall had been erupting on the Reykjanes Peninsula since March 2021, sending slow-moving rivers of basaltic lava across the surrounding valley floor. It’s the kind of eruption that draws hikers and scientists alike right up to the flow’s edge, since the lava there tends to move at a walking pace rather than exploding outward. That accessibility is exactly how footage of the so-called “lava eggs” made it into circulation in the first place.

Basaltic lava of this type is known for producing pahoehoe — a smooth, ropy, sometimes billowy surface texture that geologists distinguish from the jagged, rubbly “a’a” flows seen elsewhere. The rounded lobes captured on camera are a variant of that same pahoehoe behavior, just shaped in a way that made them look startlingly like eggs sitting in the rock.

Rock Lobe Morphogenesis Into Egg Shapes

Matthew Thirlwall broke the mechanism down for Reuters: the lava isn’t cooling from the outside in as a static mass. It’s being actively fed from within the flow itself, with fresh molten basalt continuously pushing through the interior of the stream. That internal supply keeps building pressure against the lobes forming at the flow front.

The internal flow “breaks up these egg-shaped lobes and pushes them apart,” Thirlwall told Reuters.

In practice, that means the bulbous pahoehoe lobes don’t stay fused together as one continuous mass. As new material presses in from behind, individual lobes get pinched off and shoved outward, separating into their own distinct, rounded units — which is why the flow ends up looking like a scattering of smooth eggs rather than one unbroken sheet of rock.

Invalidity of the Hawaii Comparison

The Inside Edition segment kept its focus squarely on the Reykjanes Peninsula event, and for good reason: rounded lava formations elsewhere, including features sometimes discussed in connection with Hawaiian volcanoes, come from different processes entirely and aren’t the same phenomenon documented in Iceland. What Thirlwall described is specific to how this particular basaltic flow is being fed internally as it advances — a mechanical, pressure-driven process tied directly to the ongoing Fagradalsfjall eruption, not a one-off curiosity borrowed from a different volcano on a different continent.

For anyone drawn to footage of active volcanic terrain and the odd shapes it produces, the appeal isn’t just the visual — it’s the fact that a working geologist could walk up, look at the flow front, and explain the mechanics on the spot. That’s the same kind of up-close natural spectacle that shows up in other volcano-adjacent footage, like the jungle treehouse built overlooking an active volcano, where proximity to a live eruption is the whole draw.

Reuters framed the clip as the kind of quick scientific explainer that turns into viral fodder — a real geologist giving a real answer to a strange-looking natural event, the sort of exchange that fits neatly into on-the-record explainers and interesting-news segments built around expert quotes rather than speculation.

Fagradalsfjall kept erupting well past the footage of the lava eggs, with the flow front continuing to advance and produce fresh pahoehoe lobes as long as the internal supply of molten basalt kept pushing through. As long as that supply holds, geologists like Thirlwall expect the same process — internal pressure breaking off rounded lobes at the flow’s edge — to keep happening, egg shapes and all.