Suspended magnetic lodestone on string.

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(D)Electricity and Magnetism - D+30: Magnetic Fields

Suspended magnetic lodestone on string. The magnetic 'lodestone' is a piece of iron ore that is partially magnetized. When hung on a string, the lodestone oscillates until its north-south axis aligns with the magnetic field of the earth. The ore is probably 'magnetite' (Fe3O4).
UCB Index: 
D+30+0
PIRA Index: 
5G10.16
Demo Diagram: 

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D+30+1 Large compass needle on stand.