Palagonite: The Rock That Colours Iceland's Highlands

The rust-coloured mountains that dominate Iceland's interior highlands owe their distinctive hue to one of the planet's most fascinating volcanic products: palagonite. This unique rock formation, born from the violent interaction between molten lava and ice during the last glacial period, has shaped both Iceland's landscape and its geological identity in ways that few visitors fully appreciate.

Palagonite gives the Icelandic highlands their characteristic palette of russet, ochre, and burnt orange—colours that seem almost impossibly vibrant against the stark Nordic light. Understanding this remarkable material opens a window into Iceland's tumultuous geological past and explains why the island's interior looks like nowhere else on Earth.

What Is Palagonite?

Palagonite forms through a process called palagonitisation, where basaltic volcanic glass undergoes hydration and oxidation over thousands of years. The name derives from Palagonia, Sicily, where the material was first scientifically described, but nowhere on Earth displays palagonite formations as extensively or dramatically as Iceland.

The process begins when basaltic magma encounters water or ice, causing rapid cooling that creates volcanic glass called sideromelane. Over time, this glass absorbs water and undergoes chemical changes, transforming into palagonite—a gel-like substance rich in iron oxides that gradually hardens into the rust-coloured rock we see today.

In Iceland's case, most palagonite formed during subglacial eruptions throughout the Pleistocene epoch. As volcanic activity occurred beneath thick ice sheets, the interaction between fire and ice created ideal conditions for palagonitisation on a massive scale. The iron content in Iceland's basaltic rocks provides the raw material for the striking colours that emerge during this transformation.

Formation During Ice Ages

Iceland's palagonite formations tell the story of volcanic activity during the last glacial period, which ended approximately 11,700 years ago. During this time, ice sheets up to 1,500 metres thick covered much of the island, creating unique conditions for subglacial volcanism.

When eruptions occurred beneath these massive ice sheets, several processes contributed to palagonite formation. The immense pressure from overlying ice prevented explosive eruptions, instead creating pillow lavas and volcanic breccias that cooled rapidly in the ice-cold environment. Meltwater from the ice provided the necessary moisture for the palagonitisation process, while the gradual retreat of glaciers exposed these formations to atmospheric conditions that accelerated their transformation.

The most spectacular examples of this process can be found in the móberg ridges that punctuate Iceland's landscape—elongated formations of palagonitised volcanic rock that mark the locations of ancient subglacial eruptions. These ridges, including prominent examples like Hjallafjall in the Kerlingarfjöll range, rise like rust-coloured spines from the highland plateaus.

Where to See Palagonite Formations

Landmannalaugar

The crown jewel of Iceland's palagonite landscapes lies in Landmannalaugar, part of the Fjallabak Nature Reserve in the central highlands. Here, the Bláhnúkur peak showcases some of the most vivid palagonite colouration in Iceland, with slopes painted in brilliant oranges, reds, and yellows that intensify dramatically in certain lighting conditions.

The area sits approximately 188 kilometres from Reykjavík along the challenging F208 highland road, accessible only by 4WD vehicles from June through September. The drive takes roughly 4 hours, but numerous tour operators offer day trips starting from 14,900 ISK (€95) or overnight camping tours from 28,500 ISK (€185).

The contrast between Landmannalaugar's palagonite mountains and its obsidian lava fields creates one of Iceland's most photographically striking landscapes. The famous Laugavegur hiking trail begins here, offering trekkers the chance to walk through extensive palagonite formations over its 55-kilometre route to Þórsmörk.

Kerlingarfjöll

The Kerlingarfjöll mountain range, located in the central highlands approximately 150 kilometres northeast of Reykjavík, contains some of Iceland's most extensive palagonite formations. The area combines rust-coloured palagonite ridges with active geothermal fields, creating a landscape that appears almost Martian in its otherworldliness.

Access requires driving the F35 highland road, with accommodation available at the Kerlingarfjöll Mountain Resort, where mountain huts cost from 8,200 ISK (€53) per person per night. The resort operates from June through September, offering guided geological tours that specifically focus on palagonite formations and their scientific significance.

Torfajökull Region

The Torfajökull volcanic system encompasses much of the palagonite-rich highlands between Landmannalaugar and Hekla volcano. This area showcases the geological transition between Iceland's active volcanic zones and the ancient palagonite formations created during previous glacial periods.

The region demonstrates how ongoing volcanic activity continues to interact with palagonite formations, creating complex geological relationships that attract researchers from around the world. Several scientific studies conducted here have contributed significantly to understanding palagonite formation processes.

Scientific Significance

Iceland's palagonite formations serve as natural laboratories for understanding subglacial volcanism and its products. The island's extensive palagonite deposits have provided crucial insights into similar processes occurring in other glaciated volcanic regions, including parts of British Columbia, Patagonia, and even Mars.

Research conducted by the University of Iceland and international collaborators has revealed that palagonite formation involves complex chemical processes that can take thousands of years to complete. The material acts as a natural archive, preserving evidence of past environmental conditions including ice thickness, eruption styles, and climate patterns.

NASA has used Iceland's palagonite formations as analogues for Martian geology, where similar materials may have formed during that planet's wetter past. This connection has made Iceland an important training ground for astrobiiology research and Mars mission preparation.

Visiting Palagonite Landscapes

The highland roads accessing Iceland's premier palagonite formations typically open in June and close with the first significant snowfall in September or October. Weather conditions can change rapidly in these areas, making proper preparation essential.

A robust 4WD vehicle with high clearance is absolutely necessary for accessing areas like Landmannalaugar via the F208 or Kerlingarfjöll via the F35. River crossings along these routes require experience and appropriate equipment. Many visitors choose guided tours, particularly day trips from Reykjavík that handle all logistics and provide geological expertise.

For photographers, the optimal lighting for palagonite formations occurs during the golden hours around sunrise and sunset, when the rock's iron content creates particularly intense colour displays. Weather can enhance these effects dramatically—overcast conditions often produce more saturated colours than bright sunshine.

The remote nature of these locations means visitors should carry emergency supplies, communications equipment, and inform others of their travel plans. Mobile phone coverage remains spotty throughout much of the highlands, despite recent infrastructure improvements.

Iceland's palagonite formations represent one of the planet's most accessible and spectacular examples of how volcanic processes and ice can collaborate to create landscapes of extraordinary beauty. For visitors seeking to understand the geological forces that shaped Iceland, these rust-coloured highlands provide an unparalleled natural classroom where millions of years of Earth history remain written in stone.

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