Fifteen selected, top quality micrometeorites mounted on a signed microslide marked “Collection 4”. The stones are purchased directly from Jon Larsen via Treasures From Space. The fifteen stones are in pristine condition (no weathering, low terrestrial age), complete and oriented.
MM Collection 4 - 2020
This is a unique collection with several rare phenomena, and with an exceptional documentation (color photos, analysis + SEM images of all the stones).
1. [NMM 2472] is a sculptural “giant” (~0.5 millimetres) barred olivine (BO) type micrometeorite with aerodynamic form. The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
2. [NMM 2473] is an average sized (~0.25 millimetres) porphyritic olivine (PO) type with large olivine (forsterite) crystals in chondritic glass, sprinkled on the surface by large magnetite “Christmas tree” crystals. The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
3. [NMM 2474] is a large (~0.3 millimetres) polysomatic barred olivine (BO) stone with a large nickel-iron bead in the front and distinct aerodynamic form. The surface is sprinkled with small magnetite “Christmas tree” crystals. The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
4. [NMM 2475] is a large (~0.3 millimetres) barred olivine (BO) type with a large nickel-iron bead in the front and a smaller, secondary bead in the back (due to spin, perpendicular to the length axis). Beside the front bead is an unusual glass mound. The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
5. [NMM 2477] is an average sized (~0.25 mm) scoriaceous type (ScMM/PO) tending towards porphyritic olivine. It has large vesicles with well-developed crystalline edges. On the surface are angular magnetite xls and small sulfide chunks. The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
6. [NMM 2482] is an average sized (~0.25 mm) dark vitreous (V-type, glass) micrometeorite with a nickel-iron bead surrounded by conical crystallization. The metal bead has a unique “lip”, a possible pre-stage in falling off. The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
7. [NMM 2483] is a large (~0.3 mm) smooth barred olivine (BO) type with a large nickel-iron bead in the front, surrounded by a discrete sulfide rim. In the middle, there is a glassy area with a hole, possibly due to degassing (or a lost metal bead). The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
8. [NMM 2486] is a unique (~0.27 mm) cryptocrystalline (CC) type with a cluster of four large plus five small nickel beads containing PGNs (platinum group elements). The platinum appears as dendritic crystal “trees” protruding out of the nickel-iron. This is extremely rare. The stone was found 2020 0625 on a roof in Trondheim (City Syd), Trøndelag, Norway.
9. [NMM 2754] is a large (~0.3 mm) barred olivine (BO) type with aerodynamic form and parallel orientation of the olivine (forsterite) crystals. This stone is basically one large crystal domain. The stone was found 2020 0922 on a roof in Vestby (Asko), Viken, Norway.
10. [NMM 2784] is a large (~0.3 millimetres), black cryptocrystalline (CC) type, a “turtleback” variety with a sculptural form. The stone was found 2020 1019 on a roof at Rosenvilde, Viken, Norway.
11. [NMM 2796] is a large (~0.35 mm) barred olivine (BO) type micrometeorite. In the front the olivine (forsterite) crystals are smooth, tending towards cryptocrystalline, but in the middle the olivine is coarse with large magnetite “Christmas tree” crystals on the surface. The stone was found 2020 1106 on a roof in Drøbak (Biltema), Viken, Norway.
12. [NMM 2797] is an aerodynamic (~0.25 mm) cryptocrystalline (CC) stone with a large nickel-iron bead in the front, surrounded by a large sulfide rim. Opposite the metal bead is a pyramidal, polysomatic olivine crystal domain. The stone was found 2020 1106 on a roof in Drøbak (Biltema), Viken, Norway.
13. [NMM 2805] is an average sized (~0.25 mm) rare scoriaceous type (ScMM/PO) tending towards porphyritic olivine. It has large vesicles with perfect crystalline edges and chunks of sulfide on the surface (due to low peak temperature during the atmospheric flight). The stone was found 2020 1106 on a roof in Drøbak (Biltema), Viken, Norway.
14. [NMM 2806] is a large (~0.35 mm) cryptocrystalline (CC) type with beautiful aerodynamic form and a large nickel-iron bead in the front, surrounded by a discrete sulfide rim. The nickel-iron metal is pitted (not weathering) and with visible microspherules of iron (oxide) in the nickel (see backscatter SEM images). The stone was found 2020 1106 on a roof in Drøbak (Biltema), Viken, Norway.
15. [NMM 2808] is an average sized (~0.25 mm) scoriaceous porphyritic olivine type (PO/ScMM) with large pyramidal olivine (forsterite) crystals in glass and with several rare chromite crystals on the surface (see backscatter SEM image). The stone was found 2020 1106 on a roof in Drøbak (Biltema), Viken, Norway.
All fifteen stones are a part of the collection found during the sixth season of micrometeorite findings/verification in populated areas (2020). The catalogue number refers to the NMM archive (the main index of Norwegian Micro Meteorites, Jon Larsen’s urban Stardust Collection), and the stones were found and curated by Jon Larsen.
VERIFICATION: The MMs has been confirmed extraterrestrial by SEM/EDS analysis and visual identification by Jon Larsen, and are verified micrometeorites, hereby confirmed in writing. The stones are sold with this Certificate of Authenticity, incl. classification, plus a unique portfolio of three digital color photos, three EDS analysis, and no less than 31 SEM images. Note the image credit for the micrometeorite SEM pictures: ©Jon Larsen (University of Oslo, UiO, Department of Geosciences), and the color photos: © Jan Braly Kihle/Jon Larsen.