Well it is Winter here in Tasmania!
Yesterday morning (Sunday), we woke to a medium frost. The grass was white, and the water containers for the dog, chickens and sheep were well iced over (see second pic).
Ice crystals were quite well-formed, particularly in sheltered spots.
In the first picture, the ice crystals have formed in quite unusual radial sprays. They have seeded on a piece of sheep's fleece caught up on the wire fence.
In case you didn't know, ice is a valid mineral species.