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.

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

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).

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Yours truly,

Jon Larsen