Micrometeorite Field Search Update: #1071

I’m happy to report that I completed Micrometeorite Field Search #1071 yesterday, which was carried out on a large flat roof a couple of hours drive from home in Askim, Norway. The conditions were excellent, since a high safety wall around the edges made the entire roof a micrometeorite trap.

Treasure hunt on the roof of Continental. This type of industrial buildings, with a flat roof covered with vinyl, is my favourite! Read how to find micrometeorites in the book “How To Find Micrometeorites”! © Project Stardust, 2022.

The yield? Splendid! After cleansing, I was able to extract approximately 4 g of magnetic dust. Later analyses reveal this dust included 108 micrometeorites in total:

  • 75 barred olivine micrometeorites,
  • 19 porphyritic olivine micrometeorites,
  • 11 cryptocrystalline micrometeorites,
  • 2 scoriaceous micrometeorites, and
  • 1 vitreous micrometeorite.

The mass distribution of this yield was:

  • >500 µm: 1,
  • 400-500 µm: 2,
  • 200-400 µm: 61,
  • 150-200 µm: 44
Micrometeorite expert, Jon Larsen, holds a bag of dust from micrometeorite field search #1071. © Project Stardust, 2022.
Micrometeorite expert, Jon Larsen, holds a bag of dust from micrometeorite field search #1071. © Project Stardust, 2022.

Here’s a photo of a barred olivine (BO) type micrometeorite acquired during this field search. It is approximately 0.3 mm wide and has the characteristic stripy texture of a BO micrometeorite. Note the great symmetry along its long side (y-axis).

NMM3169 a barred olivine micrometeorite collected and photographed by Jon Larsen and Jan Braly Kihle
NMM3169 a barred olivine micrometeorite collected and photographed by Jon Larsen and Jan Braly Kihle. © Project Stardust, 2022.

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Yours truly,

Jon Larsen

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