Micrometeorite NMM 4306 is a translucent V-type (vitreous, glass) with a metal bead in the front and beautiful iridescent oxidation on the surface.
The ~0.3 mm cosmic spherule is made of olive-green chondritic glass. The nickel-iron metal bead in the front has triggered crystallisation in the glass, resulting in a characteristic conical elevation. Opposite, in the back is an open gas vesicle from escaping volatiles. The surface of the glass has beautiful iridescent oxidation and a few circular pit erosion marks. These are typical on amorphous parts of micrometeorites, as the glass is less resistant towards terrestrial weathering. The stone was found on Jon Larsen’s field search # 1138, June 23rd, 2023, during fieldwork searching for micrometeorites in the flat roof of Grove Knutsen, Berger, Viken, Norway. This is a unique museum-quality micrometeorite, a jewel in any collection.
NMM 4306 - Berger (Grove Knutsen)
PROVENANCE: The catalogue number refers to the NMM archive, the index of Jon Larsen’s Project Stardust collection, which is the reference collection for urban micrometeorites. The stone was found, curated, and selected by Larsen. It is in pristine condition, fresh from Space.
VERIFICATION: The MM has been confirmed extraterrestrial by visual identification and/or SEM/EDS analysis by Jon Larsen. The stone is mounted on a signed durable aluminium/glass/cardboard microslide and is delivered together with a signed Certificate of Authenticity, and a photo file.