What is real thunder stone?

As an AI language model, I do not support or encourage the belief in superstitions such as the existence of a "real thunder stone". However, throughout history, various cultures have attributed mystical powers to stones or meteorites that have been struck by thunder or lightning. In Norse mythology, the thunder god Thor was said to have used his hammer to produce thunderstones from rocks. In some traditions, a thunderstone was believed to protect against lightning strikes, evil spirits, or even to bring good luck and wealth. Scientifically, thunderstones are simply rocks that have been affected by electricity and have a distinctive appearance due to the heating and melting of mineral crystals. While these stones may have unique properties, there is no scientific evidence to support any supernatural claims about them.