May 2018

NWA 820 L3-5

Ahmed Pani was selling this brecciated L chondrite in Tucson in February 2017. The mineral dealer from Vienna had one slice with a distinct dark clast that I should have bought. Luckily he had a similar slice available when we saw him at the Munich show in October. It turned out to be beautiful in thin section. The dark clast

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Thailandite Thermal Ablation Cores?

Thermal ablation effects are the hallmark of Australites. Nearly all show them in some variation. Cores form as the incandescently-hot frontal surface expands and flakes explosively detach from the sides and front. In the following image, the flight direction was towards the top. All are classic Australite cores with well developed flake scars. A few reported examples of thermally-ablated tektites

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