[Bernard Marx]

After seeing the image in this post and in #472, I'd like to revise everything I've written about the "square hole" rock.

Unless I'm very much mistaken both large rocks in the images are some type of vesicular igneous rock, probably basalt or rhyolite. Vesicles are the little round or oval "bubbles" formed by escaping gas when the rock is molten and very liquid. This means the rock cooled very quickly when ejected to the surface so as to preserve the shapes of the "gas bubbles." Fast-cooling igneous rocks don't allow large crystals of any kind to develop. So the square "hole" must have another explanation. I don't think this material looks anything like columnar basalt so the mystery deepens.

[AppauledAtAppeasementConservat]

"Unless I'm very much mistaken both large rocks in the images are some type of vesicular igneous rock, probably basalt or rhyolite. Vesicles are the little round or oval "bubbles" formed by escaping gas when the rock is molten and very liquid. This means the rock cooled very quickly when ejected to the surface so as to preserve the shapes of the "gas bubbles." Fast-cooling igneous rocks don't allow large crystals of any kind to develop. So the square "hole" must have another explanation. I don't think this material looks anything like columnar basalt so the mystery deepens."

Yeah, totally blasted my theory on breccia too when I first saw that the dark area in the front of the rock wasn't a vien but rather a groove. I pouted for a few days but alas it was fun to speculate!

[AppauledAtAppeasementConservat]

Hold on a sec here's some interesting data:



Notice the olivine? Still a possibility on that theory yet! That hole is too square to be caused by weathering and erosional forces. It's just to darn perfect!

[Orion78]

Is it possible that the square hole was formed from a crystal while "Sushi" was in the ground and the vesicles were formed when a meteor struck the ground and "Sushi" became a piece of ejecta?