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| Mokoia meteorite | |
|---|---|
| Name | Mokoia |
| Type | Stony-iron |
| Class | Pallasite |
| Group | Main Group Pallasite (tentative) |
| Country | New Zealand |
| Region | Bay of Plenty |
| Found date | 1908 |
| Total known weight | ~38 kg |
Mokoia meteorite is a stony‑iron pallasite discovered near Rotorua in the Bay of Plenty region of New Zealand in 1908, notable for its gem‑quality olivine and iron‑nickel matrix. The specimen links regional history, Māori cultural narratives, and scientific studies in meteoritics, planetary science, and geochemistry while being held in several institutional collections. Its recovery catalyzed collaboration among local landowners, colonial administrators, and visiting scientists from institutions such as the British Museum, the University of Otago, and later the Smithsonian Institution.
The find was reported by a landowner near the Mokoia Island area of Lake Rotorua in 1908, prompting interest from colonial officials at the Native Land Court and curators at the Auckland Museum, Canterbury Museum, and the Victoria University of Wellington. Local Māori elders conveyed oral accounts to missionaries and ethnographers, while professional collectors from the Geological Survey of New Zealand and representatives of the British Museum (Natural History) negotiated acquisition. Specimens were transported via Wellington Harbour and later exchanged through correspondence with curators at the Natural History Museum, London, the Field Museum of Natural History, and the American Museum of Natural History.
Early classification placed the specimen among pallasite types; subsequent studies by petrographers at Imperial College London and geochemists at the Australian National University refined its assignment to the Main Group pallasites based on metal composition, oxygen isotopes, and olivine chemistry. Analyses using techniques developed at Caltech, the University of Chicago, and the Max Planck Institute for Chemistry showed an iron‑nickel matrix dominated by kamacite and taenite, with trace phases comparable to those in Imilac, Esquel, and Brahin pallasites. Geochemical signatures measured with instruments at the Scripps Institution of Oceanography, ETH Zurich, and the Woods Hole Oceanographic Institution support a parent‑body history similar to that inferred for other Main Group pallasites.
Thin section petrography performed by researchers affiliated with University College London and the Smithsonian Astrophysical Observatory revealed well‑preserved olivine crystals (forsterite‑rich) embedded in a coherent iron‑nickel matrix; electron microprobe work at Leiden University and Stanford University quantified nickel, cobalt, and phosphorus distributions. Accessory and interstitial minerals identified by teams from the University of Tokyo and Brown University include schreibersite, daubréelite, and troilite, consistent with high‑temperature equilibration and slow cooling akin to deep planetary core–mantle boundary environments proposed by researchers at the Open University and University of California, Berkeley. Studies using transmission electron microscopy at the Kavli Institute and synchrotron X‑ray diffraction at Diamond Light Source characterized submicron zoning and shock features comparable to those reported for Brenham and Hoba.
Cosmogenic nuclide studies conducted by teams at the University of New Mexico, the Centre national de la recherche scientifique, and the University of Münster used isotopes such as 26Al, 36Cl, and noble gases to estimate exposure ages and preterrestrial irradiation. Results align Mokoia with exposure histories reported for many Main Group pallasites, indicating prolonged exposure in the regolith of a differentiated parent body followed by a collisional ejection event modeled by researchers at the Southwest Research Institute and NASA Jet Propulsion Laboratory. Radiometric constraints derived from argon‑argon and uranium‑lead work at the Geological Survey of Canada and Vrije Universiteit Amsterdam place crystallization and equilibration in the early Solar System within the first tens of millions of years, concordant with formation times inferred for other stony‑iron meteorites studied at the Max Planck Institute for Solar System Research.
The find influenced local Māori interactions with colonial science and collectors, drawing attention from ethnographers associated with the Royal Geographical Society, the Polynesian Society, and the Anthropological Institute. It appears in early 20th‑century New Zealand newspaper reports archived by the National Library of New Zealand and was referenced in geological syntheses published by the New Zealand Geological Survey. Internationally, Mokoia contributed to debates at meetings of the International Astronomical Union, the American Geophysical Union, and the European Geosciences Union about pallasite genesis, and it featured in public exhibitions at institutions such as the British Museum, the Auckland War Memorial Museum, and the Museum of New Zealand Te Papa Tongarewa.
Type and reference slices reside in institutional collections including the Auckland War Memorial Museum, the Canterbury Museum, the Museum of New Zealand Te Papa Tongarewa, the Natural History Museum, London, and the Smithsonian Institution National Museum of Natural History. Curatorial records are maintained in archives at the Hocken Collections and the Alexander Turnbull Library, and loaned samples have been studied at laboratories affiliated with the Royal Society of New Zealand, CSIRO, and the University of Sydney. Conservation, cataloguing, and isotopic sampling protocols follow standards promulgated by the International Meteorite Nomenclature Committee and are overseen by curators and researchers who collaborate through networks such as the Meteoritical Society and the International Union of Geological Sciences.
Category:Meteorites found in New Zealand Category:Pallasites