Question

this special property of uraninite is dangerous, it can be detected by a geiger counter: radioactivity magnetism fluorescence piezoelectric

Explanation:

Uraninite contains uranium, which is radioactive. A Geiger counter is specifically designed to detect radioactivity. Magnetism is detected by tools like magnets or magnetometers. Fluorescence is observed under ultraviolet light. Piezoelectricity relates to electrical charge from mechanical stress.

Answer:

Radioactivity