Polished Black Tourmaline Freeform

This is a polished black tourmaline Freeform. It's a naturally dark, opaque black color. You'll find that it has a smooth feel from being polished.

An interesting fact about tourmaline is that it's a pyroelectric and piezoelectric mineral. This means it can generate an electrical charge when heated or when subjected to pressure. This property was actually known for centuries, with early Dutch traders using heated tourmaline to draw ash from their pipes, calling it "aschenzieher" or "ash puller." If you're looking for a simple, natural stone with a unique scientific background, this black tourmaline piece might be of interest.