Hematite is the mineral form of iron oxide (Fe2O3). Hematite is magnetic and care must be taken when using this element around things like deflectors because they can be charged with its polar element Magnasite which is also magnetic. If the two elements come into contact with one another it can generate a feedback pulse and you can get shocked.

In 2370, Miles O'Brien asked Joseph to have a look at a hematite deposit on Orellius Minor as a reason to distract and incapacitate him. (DS9: "Paradise")

In 2378, while taking off from Ledos Seven of Nine and Chakotay crash into an energy barrier. They try to use the deflector to breach it but a little girl wearing hematite beads gets too close and she gets shocked in the process. (VOY: "Natural Law")

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