A Very "Busy" Australite
by Phil Morgan
This month, we'll take a visual tour of an Australite boat (4g) with several interesting features. We'll begin right at the bottom of things. In the photo below, you can see the flow lines from ablation. Other boats I've seen have melt "waves" running up off the sides rather than threads like this heading for the ends.
Next, if we roll it up on the side we can observe where a wedge-shaped piece has broken out. This is a great example of where the thermal stress shell breaks away to form the many Australite cores that are found.
Moving to the top, one may observe other stress fractures outlining the "core" of this specimen. I can't quite figure out what happened to the end on the left. It's quite complicated and intricate texturing but one of the more interesting features is a small blob that we welded to the surface. There is a close-up of this feature below.
Here is a close-up of the welded blob. The end of the tektite is to the right in this picture. In the lower right-hand corner are some thick flow features stretching toward the blob.
And lastly, we get to the other side. Note that I swapped ends on this picture to keep it right side up. Here we see the result of a burst bubble. It appears that when the bubble burst, it blew off a decent-sized flake with the resulting scar partially covered by ablation material.
I hope you've enjoyed the tour!