Iberulite
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Iberulites are a particular type of microspherulites (Fig. 1) that develop in the atmosphere (troposphere), finally falling to the Earth's surface. The name comes from the Iberian Peninsula where they were discovered.
Iberulites are a particular type of microspherulites (Fig. 1) that develop in the atmosphere (troposphere), finally falling to the Earth's surface. The name comes from the Iberian Peninsula where they were discovered. These microspherulites are mostly spherical in shape (roundness index=0.95), with 60-90 μm modal diameter, although some particles can be up to 200 μm in diameter. According to this roundness index, these microspherules are really elongated spheroids with two axes defined along a polar plane and typically presenting a depression or vortex. The presence of plant filaments in the atmosphere can distort these shapes and sizes. In any case, these are uncommon “giant” aerosol particles.
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Text derived from https://en.wikipedia.org/w/index.php?oldid=1373272620 under CC BY-SA 4.0; modifications have been made.