Description: Formed in the first fifty million years after the birth of our Solar System, nearly 4.5 billion years ago, this Aletai iron meteorite slice is not merely a metallic plate, but a fragment of a planetary core, the exposed skeleton of a world that once existed and was later shattered by cosmic collision. Long before Earth had oceans, before continents stabilised, before life began its slow unfolding, molten metal separated deep within a protoplanet. Iron sank toward its centre. Nickel alloyed within it. And in the silent darkness of space, that metallic core began to cool. Not over centuries. Not over millennia. But at a rate of mere degrees per million years. It is this impossibly slow cooling that created the extraordinary internal architecture visible across this slice, the Widmanstätten structure, an interlocking crystalline geometry of kamacite and taenite that cannot be reproduced artificially under terrestrial conditions. The broad lamellae crossing at angular intervals are not fractures and not damage, but metallic crystals that grew in perfect order inside a planetary nucleus. The chemical group IIIE to which Aletai belongs is rare within the already scarce category of iron meteorites, themselves representing only around five percent of known meteorite falls. Each group carries its own elemental fingerprint, defined by nickel content and trace elements such as gallium, germanium, cobalt, phosphorus, and iridium. These chemical signatures act as cosmic barcodes, confirming origin in differentiated parent bodies that no longer exist. This particular specimen, weighing 30.62 grams and measuring 40 × 35 × 3 mm, reveals a medium to coarse octahedrite structure, with beautifully defined lamellae exposed through precision cutting, polishing, and controlled acid etching. The nitric acid selectively dissolved portions of kamacite, allowing the internal crystalline matrix to emerge in full clarity. And then comes the detail that transforms this slice from scientific artefact into visual phenomenon. Under directional light, certain lamellae ignite in warm golden reflections. This is not oxidation. Not coating. Not enhancement. It is the natural optical interaction between light and the anisotropic Fe Ni crystalline structure. The taenite rich zones reflect differently from the kamacite bands, producing subtle golden tones that shift depending on viewing angle. It is a quiet metallic aurora, a structural effect born from cosmic metallurgy. Unlike many commercial slices that present flat monochrome contrast, this specimen displays dynamic variation across its surface, long continuous bands, intersecting angular plates, zones of subtle tonal transition, and isolated inclusions that add individuality. The central banding structure creates compositional symmetry, while peripheral intersections provide visual depth and crystalline rhythm. The slice thickness of 3 mm offers ideal structural stability while preserving visual transparency of pattern. Too thin and deformation risks increase. Too thick and pattern readability diminishes. This piece sits precisely in the balance point prized by serious collectors. Recovered in the Altay region of Xinjiang Province, China, the Aletai meteorite represents material from a differentiated planetary core that formed in the earliest epoch of Solar System history. Its age predates Earth’s crust. Its structure records cooling processes that occurred in complete silence in interplanetary space. Its existence testifies to catastrophic collision, fragmentation, and eventual descent through Earth’s atmosphere. This is not decorative metal. It is exposed planetary architecture. It is cosmic metallurgy frozen in time. It is 4.5 billion years of history held in the palm of your hand. Specifications: • Weight: 30.62 g • Dimensions: 40 × 35 × 3 mm • Origin: Aletai, Xinjiang Province, China • Type: Iron meteorite • Chemical group: IIIE • Structural classification: Medium to coarse octahedrite • Composition: Iron Nickel alloy Fe Ni with variable nickel content and trace elements including cobalt, phosphorus, gallium, germanium, and iridium • Structure visible: Widmanstätten pattern with intergrowth of kamacite and taenite • Cooling rate: Estimated 1 to 100 °C per million years within parent body • Formation age: Approximately 4.5 billion years • Parent body origin: Differentiated protoplanetary core • Surface treatment: Cut, polished, acid etched to reveal internal structure • Optical behaviour: Directional golden reflectivity due to anisotropic metallic lamellae • Thickness: 3 mm collector optimal stability slice Notable Points: • Belongs to the rare IIIE chemical group, representing a specific and limited planetary parent body signature within iron meteorites. • Displays a clearly defined Widmanstätten structure formed exclusively through ultra slow cooling inside a planetary metallic core, impossible to replicate artificially. • Exhibits directional golden reflections under controlled lighting due to structural anisotropy between kamacite and taenite phases, a phenomenon absent in many standard commercial slices. • Medium to coarse octahedral lamellae with strong geometric intersections and visible crystallographic continuity across the slice. • Represents material from a differentiated protoplanet formed during the earliest stage of Solar System evolution. • Iron meteorites constitute only approximately five percent of known meteorite finds, making this class inherently rare compared to stony meteorites. • Structurally stable 3 mm thickness offering optimal balance between durability and pattern clarity. • Precision cut and acid etched surface revealing pristine metallic crystallography without artificial enhancement. • Scientifically significant example of planetary core material, preserving exsolution textures formed over millions of years. • Strong display presence with dynamic metallic contrast and structural rhythm across the full surface. Collector’s Interest: Aletai IIIE slices with this level of structural definition and directional optical variation are increasingly sought after by advanced meteorite collectors. The combination of clear Widmanstätten geometry, documented chemical classification, optimal thickness, and golden anisotropic reflection places this specimen above standard decorative iron slices. It functions simultaneously as scientific evidence, display artefact, and planetary relic. For collectors focused on differentiated planetary materials, this represents a fragment of metallic core architecture, not surface debris, but internal planetary structure. Lapidary Potential: While best preserved as a scientific and collector specimen, the structural clarity and metallic contrast make it suitable for premium framing or museum style mounting. Any modification would compromise its crystallographic integrity, and therefore preservation in its current state is strongly recommended to maintain both aesthetic and scientific value. ————— Shipping and Handling: All orders are shipped by Portuguese National Post. • Dispatch time: within 1 to 3 business days after payment confirmation to Catawiki • Transit time with CTT service: between 5 to 7 business days within europe and worldwide, depending on destination national post. • A tracking number is always provided Photography and transparency: All photographs are taken under controlled lighting conditions using a macro lens, carefully selected to present each specimen as accurately as possible. No filters, colour enhancement, or artificial saturation are applied. The lighting setup uses a calibrated 5500K light source, replicating neutral daylight to reveal natural tones, surface features, and internal characteristics. Under warmer or weaker indoor lighting, colours may appear slightly different, which is normal. The purpose of this photographic process is documentation and representation, not visual enhancement. Images are intended to reflect the specimen faithfully as it appears under balanced natural light conditions. Identification and ethics: All specimens offered are natural and described to the best of our knowledge, based on direct sourcing, professional experience, and information provided by trusted suppliers working at the origin. Every effort is made to ensure transparency and accuracy regarding identification, locality, and general characteristics, avoiding misleading statements about treatment, provenance, or nature. Customs and import taxes: Any customs duties, import fees, or local taxes applied by the destination country are entirely the responsibility of the winning bidder. These charges are not included in the auction price or shipping cost and are determined by the buyer’s local authorities. Guarantee and resolution: Customer satisfaction is important. In the unlikely event of an issue such as loss, damage, or discrepancy, please contact us promptly through Catawiki’s messaging system. Each case is handled individually and fairly, with appropriate solutions offered when justified. Appreciation and commitment: We sincerely thank you for your trust. Our work focuses on careful selection, accurate representation, and respectful presentation of mineral specimens with character and interest. Each piece is chosen for its individual qualities rather than speculative or financial considerations. We aim to provide a transparent, reliable, and consistent experience for collectors at all levels. With gratitude, GemPulse Minerals