7 Most Massive Single Meteorites on Earth


Ahnighito or Tent meteorite c.1894: Photographer unknown via Meteorite Recon

Like fugitives on the run from distant solar systems, meteors hurtle through the earth’s atmosphere, lighting up the eyes of observers on the ground. Often these fireballs of metal and rock burn up in a blaze of glory, and many do not survive their impact with the Earth’s surface. Those that do though start a more settled life here on Earth as meteorites. Some might even claim to be the new sheriffs in town – they’re that big and resistant to weathering.

Back in the day: Willamette meteorite pre-1923
Photographer unknown via NASA

Here’s our magnificent 7 of the most massive known single meteorites on earth – iron monsters that have remained in one piece for thousands of years.

7. Willamette, USA: Estimated weight: 15.5 tonnes

Photo: Dante Alighieri

At 7.8 metre sq and 15.5 tonnes, Willamette is the largest meteorite found in the US, a peculiarly pitted lump composed of 91% iron and 7.62% nickel, with no impact crater preserved at its original site in Oregon.

Aspiring supermen: Two boys sitting in the Willamette Meteorite 1911
Two_boys_sitting_inside_the_Willamette_Meteorite_Boys sitting in the Willamette Meteorite 1911: _1911Photo:
Photo: American Museum of Natural History published in the New York Times

Though revered by Native Americans – who still contend it should be returned – Willamette’s modern discovery was made by settler Ellis Hughes in 1902. Recognising its significance, Hughes spent three months of hard labour moving the meteorite ¾ of a mile from land owned by the Oregon Iron and Steel Company to try to claim it as his own. He was caught however, and the meteorite was subsequently bought for $26,000, later to be displayed in the American Museum of Natural History.

6. Mbosi , Tanzania: Estimated weight: 16 tonnes

Photographer unknown via Jensen Meteorites

Officially discovered in 1930 – though at the time believed to be a stone sacred to indigenous people – Mbosi is Tanzania’s meteorite giant, a large piece of space metal estimated at 16 tonnes. As with many meteorites, there is no sign of the crater it must have created on striking the Earth’s surface, which may indicate that it rolled like a boulder after landing or simply affirm that it has been here for thousands of years.

On a pedestal: Mbosi meteorite 1967
Photographer unknown via Arquivos Do Insolito

Back in 1930, Mbosi was only half visible, so deeply was it buried in the soil; today the soil around it has been excavated and a plinth constructed beneath it, though its original position is said to be preserved.

5. Agpalilik, Greenland: Estimated weight: 20 tonnes

Photo: FunkMonk

Discovered in 1963 by Vagn F. Buchwald, Agpalilik, aka the Man, is the fourth major piece of Greenland’s Cape York meteorite and the smaller of the Cape’s two celestial visitors that make our top seven. Still, at a less than modest 20 tonnes, it’s not to be scoffed at, and can be seen at the Geological Museum in Copenhagen.

Shifting a lump: Agpalilik meteorite being moved
Photographer unknown via Gabriel

The Cape York meteorite from which the Agpalilik is derived smashed into the Earth almost 10,000 years ago and is one of the largest iron meteorites on the planet. For centuries, Inuit living near the earlier located pieces used them as a source of metal for tools and weapons, before tales of their existence pricked the ears of scientists back in 1818. Between 1818 and 1883, five expeditions set out to track down the rogue iron source, all of which failed.

4. Bacubirito, Mexico: Estimated weight: 22 tonnes

Bacubirito_meteorite_Mexico4 metresPhoto:
Photographer unknown via Meteorite Art

The great Bacubirito meteorite is undoubtedly Mexico’s finest and one of the largest single space objects to have been sent on a collision course with the Earth and survived. Estimated to weigh 22 tonnes, this crooked, four-metre-long slab of iron is on display at the Centro de Ciencias de Sinaloa in Culiacan, where it draws visitors keen to measure up against it.

Dig this: Bacubirito meteorite found in 1863
Photographer unknown via Meteorite Art

The monster of a meteorite that is Bacubirito was discovered by American geologist Gilbert Ellis Bailey in 1892 – who had been sent by Chicago journal the Interocean to Central and South America – and excavated with the help of local people. Like all meteorites, it was named after the place where it was found. A mighty fallen shooting star.

3. Ahnighito, Cape York, Greenland: 31 tonnes

Photo: VSmithUK

The largest chunk of the Cape York meteorite, Ahnighito, known to the Inuit as the Tent, is at 31 tonnes the heaviest meteorite ever moved by man. Rumours of the Greenland iron had reached scientific circles in 1818, but it was 1894 before the American Arctic explorer Robert E Peary finally located its source – with the help of a nameless local guide.

Precarious operation: The Ahnighito being launched on board Peary’s ship
Photographer unknown via Meteorite Recon

It took Peary three years to get the heavy meteorites onto ships – not to mention the building of Greenland’s only railroad plus invaluable Inuit help – but the explorer did contrive to sell his prizes to the American Museum of Natural History for a cool $40,000. At the museum, where the meteorite remains to this day, a display stand needed to be built whose supports reach directly into the bedrock below to hold Ahnighito’s massive 12.1 metre sq-bulk.

2. El Chaco, Argentina: Estimated weight: 37 tonnes

Photographer unknown via Planeta Pia

The largest fragment of the iron meteorite that splintered to form the Campo del Cielo group of meteorites and the 60 sq km crater field of the same name in Argentina, El Chaco is a colossal chuck of a space object. It is the second heaviest single-piece meteorite recovered on Earth – though the total mass of the Campo del Cielo fragments would have it claim the title at a canter.

Halleluiah: Campo del Cielo’s 37-tonne El Chaco put into scale
Photographer unknown via Jensen Meteorites

El Chaco was located in 1969 at a depth of 5 metres using a metal detector, though its surrounding craters – estimated at 4,000–5,000 years old – were reported in 1576 and already well known to the aboriginal inhabitants of the area. Sensationally, in 1990 a local Argentinean police officer foiled a plot by meteorite hunter Robert Haag to steal El Chaco, which at the time had already been moved out of the country.

1. Hoba, Namibia. Estimated weight: 60 tonnes

Photo: coda

The runaway winner at approaching twice the weight of its nearest rival, Namibia’s Hoba must have taken some stopping. Measuring over 6.5 metres sq, this 60-tonne slab of metal is believed to have been slowed by the Earth’s atmosphere to the point where it fell to the surface at a speed that left it intact and barely buried. It’s even been suggested that the meteorite’s unusually flat shape caused it to skip along much as a skipping stone bounces across water. Nice moves.

What have we here: One of the earliest known photos of the Hoba, around 1930
Photographer unknown via Giant Crystals

Thought to have landed less than 80,000 years ago, Hoba is composed of about 84% iron and 16% nickel, and remains the most massive known naturally-occurring hunk of iron at the Earth’s surface. Due to its large mass, it’s not been moved from where it fell since being discovered in 1920 by a farmer ploughing his field – who heard a loud scraping before his oxen came to a rather abrupt halt. Having suffered much vandalism, this beast is now visited by thousands of tourists a year.

One mighty meteorite: Early traveller visiting the exposed Hoba, around1955
Photographer unknown via Giant Crystals

Note: At a rumoured 28 tonnes, Armanty in Xinjiang, China should have made the roll-call, but unfortunately information and pictures pertaining to this meteorite were too scarce to come by.

Sources: 1, 2, 3, 4, 5, 6, 7, 8, 9