Aletai meteorite is an iron meteorite classified as Iron, IIIE-an, recovered from a 430 km strewn field in Xinjiang, China — the longest confirmed meteorite strewn field on Earth. It entered the atmosphere at an angle of just 6.5° to 7.3°, skipping across the upper atmosphere instead of impacting directly. No crater was ever formed.
The Fall: A 6.5° Entry Angle That Changed Everything
Most meteorites hit Earth at angles between 30° and 60°. At those angles, the kinetic energy concentrates at a single impact point. The result is a crater.
Aletai came in differently.
According to Li et al. (2022), published in Science Advances, the Aletai parent body entered Earth’s atmosphere at just 6.5° to 7.3° — one of the shallowest confirmed entry angles of any large meteorite fall on record. At that angle, atmospheric drag acted across the entire body rather than at a single point. The meteorite didn’t strike the Earth. It skimmed across the upper atmosphere, fragmenting progressively, distributing its mass across the landscape the way a flat stone distributes force across the surface of water.
The initial parent body is estimated to have exceeded 200 tons. By the time the fragments reached the ground, they had spread across a 430 km corridor in what is now the Altai region of Xinjiang. Not a single impact crater was left behind. The fragments simply settled into the soil under gravity.
This is the Aletai strewn field — the longest on Earth.
The Silver Camel: First Contact in 1898
Humanity’s first recorded encounter with Aletai meteorite happened in 1898.
Kazakh herdsmen working the remote steppe of Xinjiang discovered an enormous iron mass half-buried in the ground. It weighed 28 tons. Its shape — a broad, low form crouched against the earth, its fractured surfaces catching the light like hammered silver — reminded them of a camel resting in the desert. They called it the Silver Camel, or Armanty in the local language.
The Silver Camel is currently the fourth largest iron meteorite on Earth.
For more than a century after its discovery, scientists and explorers followed its trail. The Silver Camel was not an isolated find — it was the largest surviving fragment of a much larger event. Working outward from Armanty, researchers eventually mapped the full extent of the 430 km strewn field, recovering dozens of additional fragments and reconstructing the geometry of the original fall.
Classification: What Iron, IIIE-an Actually Means
Aletai meteorite is formally classified as Iron, IIIE-an in the Meteoritical Bulletin database.
Iron meteorites are classified into chemical groups based on trace element ratios — primarily germanium, gallium, iridium, and nickel — measured through instrumental neutron activation analysis (INAA). These ratios reflect the composition of the parent asteroid’s core and are used to determine whether different meteorite specimens originated from the same parent body.
IIIE is a small chemical group. Aletai carries the additional designation “an” — anomalous — meaning its trace element chemistry does not fit cleanly within the standard IIIE group parameters. This anomalous classification indicates Aletai’s parent asteroid had a distinct chemical history, likely a unique crystallization sequence within its molten core.
Nickel content: 9.8 wt%, as determined by INAA analysis (Wasson et al., UCLA).
The Crystal Structure: Why Aletai Looks the Way It Does
Cut and acid-etched, Aletai meteorite reveals the Widmanstätten pattern — interlocking bands of kamacite (low-nickel iron, approximately 6% Ni) and taenite (high-nickel iron, approximately 30% Ni) that formed during the slowest cooling process in the known universe.
Aletai’s kamacite bandwidth measures 0.9 to 1.4 mm, placing it on the coarse–medium octahedrite boundary — broad enough to be clearly visible to the naked eye. The broad bands are clearly visible to the naked eye, creating the geometric pattern that is unique to each individual specimen.
This bandwidth is directly related to cooling rate. According to Li et al. (2022), Aletai cooled at approximately 10 to 40°C per million years — deep inside the insulated core of its parent asteroid, shielded from any external temperature variation. No laboratory process can replicate this cooling rate. The Widmanstätten pattern in genuine Aletai meteorite cannot be artificially manufactured.
Schreibersite: The Chemistry of Life
Aletai meteorite contains 2 to 3% schreibersite by volume — an iron-nickel phosphide mineral with the formula (Fe,Ni)₃P.
Schreibersite is significant beyond its role in the crystal structure. Phosphorus is one of the six essential elements for life on Earth, forming the backbone of DNA and ATP. In the early solar system, phosphorus in the form readily usable by organic chemistry was scarce. Schreibersite-bearing meteorites are currently the leading candidate for the delivery mechanism that seeded early Earth with biologically accessible phosphorus.
Research published in Nature Chemistry has demonstrated that schreibersite reacts with water to produce phosphonate and phosphate compounds — the exact forms of phosphorus used in biological systems.
The schreibersite in your Aletai pendant carries phosphorus that has been part of iron-nickel metal since before Earth existed.
Aletai vs. Other Meteorites Used in Jewelry
Three iron meteorites dominate the meteorite jewelry market: Aletai, Muonionalusta, and Gibeon. They are not interchangeable.
| Aletai | Muonionalusta | Gibeon | |
|---|---|---|---|
| Classification | Iron, IIIE-an | Iron, IVA | Iron, IVA |
| Kamacite bandwidth | 0.9–1.4 mm | 0.23–0.43 mm | 0.23–0.43 mm |
| Nickel content | 9.8 wt% | 8.42 wt% | 7.7 wt% |
| Oxidation resistance | Moderate | Poor | Excellent |
| Known reserve | ~74 tons | ~230 kg | Larger |
| Strewn field | 430 km | Single find area | Multiple finds |
Muonionalusta is classified IVA and is known within the meteorite community as a problematic material for jewelry. Its fine bandwidth (0.23–0.43 mm) produces a visually dense pattern, but its chloride-driven corrosion susceptibility and internal structure make it significantly more prone to deep oxidation than Aletai. Reddit communities dedicated to meteorite identification frequently flag Muonionalusta pieces for aggressive rusting within months of purchase. For practical wearing and storage guidance, see Movalor’s Materials & Care.
Gibeon has excellent oxidation resistance due to its higher structural homogeneity, but its visual pattern is finer and its origin — Namibia, scattered across a large area over geological time — lacks the singular narrative of Aletai’s documented fall.
Movalor works exclusively with Aletai. The choice is specific: the bandwidth is visible, the fall is documented, the science is published, and the material is finite.
How Old Is Aletai Meteorite?
Aletai meteorite is approximately 4.5 billion years old — roughly the same age as Earth itself.
Both formed from the same solar nebula during the formation of the solar system. Earth’s original surface has been continuously recycled through plate tectonics, volcanism, and erosion. Aletai’s parent asteroid, small enough to cool slowly without geological activity, preserved its original structure.
The iron-nickel alloy in Aletai has existed in essentially its current form since the asteroid’s core solidified, approximately 4.5 billion years ago. View Movalor’s Aletai iron meteorite pendants.
FAQ
What is Aletai meteorite? Aletai meteorite is an iron meteorite classified as Iron, IIIE-an, recovered from a 430 km strewn field in Xinjiang, China. It is one of the largest meteorite fall events on record and the source of the fourth largest iron meteorite ever found, the 28-ton Armanty specimen known as the Silver Camel.
How old is Aletai meteorite? Approximately 4.5 billion years — roughly the same age as Earth. Both formed from the same solar nebula during the early solar system.
Where is Aletai meteorite found? In the Altai region of Xinjiang, China, across a strewn field stretching 430 km. The strewn field was mapped following the discovery of the Silver Camel (Armanty) in 1898 and contains dozens of confirmed fragments with a total recovered mass of approximately 74 tons.
What makes Aletai meteorite different from other meteorites used in jewelry? Aletai has a kamacite bandwidth of 0.9 to 1.4 mm — producing a broad Widmanstätten pattern clearly visible to the naked eye. Its entry angle of 6.5° to 7.3° is one of the shallowest confirmed for any large meteorite fall, resulting in a 430 km strewn field with no impact crater. Its IIIE-an anomalous classification reflects a unique chemical history within its parent asteroid.
Is Aletai meteorite the same as Muonionalusta? No. They are different meteorites from different parent bodies with different chemical classifications. Aletai is Iron, IIIE-an with 9.8 wt% nickel and 0.9–1.4 mm kamacite bandwidth. Muonionalusta is Iron, IVA with 8.42 wt% nickel and 0.23–0.43 mm bandwidth. They are visually and chemically distinct.
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Aletai meteorite, cut and finished into wearable form.