SKU: 90939786804

Kaalijärv Iron Meteorite Slice, IAB-MG, 33.38g, Neumann Bands

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Description

Kaalijärv Iron Meteorite Slice, IAB-MG, 33.38g, Neumann BandsBronze Age impact specimen with shock deformation features This 33. 38g slice from the Kaalijrv impact site reveals Neumann bands cutting through kamacite lamellae within the classic Widmansttten pattern. The bands appear as fine parallel lines crossing the broader octahedral structure, evidence of shock compression during the meteorite's violent arrival approximately 3,500 years ago. The etched surface exposes both features simultaneously: the

Bronze Age impact specimen with shock deformation features

This 33.38g slice from the Kaalijärv impact site reveals Neumann bands cutting through kamacite lamellae within the classic Widmanstätten pattern. The bands appear as fine parallel lines crossing the broader octahedral structure, evidence of shock compression during the meteorite's violent arrival approximately 3,500 years ago. The etched surface exposes both features simultaneously: the geometric intergrowth of iron-nickel alloys formed during slow cooling in a parent body core, overlaid by deformation structures from terrestrial impact.

Kaalijärv material originates from a well-documented crater field on Saaremaa Island, Estonia. The impact occurred during the Bronze Age, within the timeline of human settlement in the region. This specimen preserves both its extraterrestrial metallurgy and the record of its collision with Earth.

Octahedral structure and shock features

The Widmanstätten pattern results from kamacite and taenite crystallizing along octahedral planes as the parent body core cooled over millions of years. Etching with acid preferentially attacks kamacite, revealing the three-dimensional geometry as intersecting bands across the polished surface.

Neumann bands are shock-induced deformation twins within kamacite crystals. They form when intense pressure causes the crystal lattice to deform along specific planes without melting. In this specimen, the bands cross the existing octahedral structure at angles, creating a secondary linear pattern distinct from the broader Widmanstätten lamellae. Their presence confirms shock pressures consistent with high-velocity impact.

IAB complex meteorites and differentiated parent bodies

IAB-MG (medium-coarsest octahedrite) iron meteorites belong to the IAB complex, a diverse group showing evidence of both igneous differentiation and impact disruption. Their parent body likely experienced partial melting and metal-silicate separation before catastrophic fragmentation mixed metallic and silicate components. The resulting mixture underwent slow cooling within reassembled debris, producing the octahedral structure visible in this specimen.

Iron meteorites represent the cores of ancient planetesimals that differentiated early in solar system history. These bodies formed within the first few million years after solar system formation, preserving metal alloy compositions and cooling rates that provide constraints on planetary accretion processes. Learn About Meteorites offers additional context on classification and formation environments.

Frequently asked questions

Is this meteorite authenticated? Kaalijärv is classified as Iron IAB-MG in the Meteoritical Bulletin. Material from this locality has been studied extensively due to its association with the Saaremaa crater field. Verification: MetBull search. This specimen includes a certificate of authenticity.

What are Neumann bands? Neumann bands are planar deformation features within kamacite crystals, formed when shock compression causes the iron lattice to twin along specific crystallographic planes. They appear as fine parallel lines that cross the Widmanstätten pattern at characteristic angles. Their presence indicates shock pressures between 13 and 40 GPa, typical of high-velocity impacts.

What is included with this specimen? The listing includes the 33.38g etched slice and certificate of authenticity documenting classification and provenance.

What makes the Kaalijärv impact site scientifically significant? The crater field on Saaremaa preserves a well-dated Bronze Age impact event with material distributed across multiple craters. The chronology places the impact within human history, making it one of the few meteorite falls that occurred during documented settlement periods. The site provides data on small-body atmospheric entry and ground-level cratering processes.

Display quality and structural clarity

Kaalijärv specimens with visible Neumann bands offer collectors both extraterrestrial metallurgical structure and terrestrial shock features in a single piece. The combination of octahedral geometry and linear shock deformation creates layered complexity across the etched surface. Material from this locality carries additional historical context through its association with a documented Bronze Age impact site.

This 33.38g slice provides clear visibility of both structural systems without requiring magnification. The surface preparation exposes intersecting features at angles that emphasize their geometric relationships. For collectors seeking shock-bearing iron meteorites with known impact histories, Kaalijärv material represents accessible entry into this subset. Browse additional options in our Iron Meteorites collection.

Meteoritical Bulletin entry: Kaalijarv | Classification: Iron IAB-MG | Find, Estonia, 1937

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SKU: 90939786804

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