We have done some micro-CT studies of ice in the past but when I went to start my car one morning, I saw some interesting ice crystals on my windshield. It was really windy so I am guessing that a water droplet got blown around on the glass but the remarkable thing is the straightness of the lines. I wouldn’t have thought this would be natural. There were three different parts of the windshield as well. Only one are came out well in the pictures.
I wish I could have saved some for scanning. It would have been a nice compliment to our February post of the science of snow.
If you have an idea of why they are so straight, feel free to add them in the comments.