or
Appears to be carbon ice crystals.
Whatever it is doesn’t cast a shadow.
https://en.wikipedia.org/wiki/Needle_ice
I was at a site out in the woods and saw, for the first time, “needle ice”. Happens when the soil, moisture and temperature conditions are just right. Creates tiny “icicles” that poke up out of the ground.
Where I was it followed linear alignments based on the shadows of the trees. I THINK(?) it occurred in the sunlit areas, and was absent in the shadows of the fir trees.