This specimen of Lodestone is only a couple of cm long. It is a magnetic rock called magnetite used as one of the earliest compasses. Here it is shown with some iron filings attracted to to it. This also shows the areas of greatest magnetisation.
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Magnetic viewing film allows one to visualise magnetic fields easily. Of interest is the segmented field from the top magnet which is not apparent by just looking at it. The old AlNiCo bar magnet on the left has a very distorted field.
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A black oily magnetic liquid forms strange spikes when a magnet is applied. Ferrofluid is a bizarre fluid that is magnetic made of nano sized magnetite particles contained in micelles in a mineral oil base.
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