Well, step one, don’t break it any further. My first guess was tungsten hematite. A common metallic ceramic; used in heat spreaders and “goth” jewellery. But that’s highly magnetic.
So my second choice? Boron carbide. Boron is a diamagnetic material that becomes magnetically neutral (nearly) when alloyed at near 50/50 with carbon. It’s hard, space wise, but brittle. Items are made by dumping a dry powder into a mould and compressing it under many many tons of pressure. It’s difficult to break initially but once damaged can be crumbled easily. C5B is a common choice in high leakage electrical environments. As is it’s non toxic. But do NOT get it wet. You quickly get Boron Hydroxide. A relativly toxic gas. Which is why boratic acid laundry soap has sulphur in it. Which stabilises the reaction to non-toxic gases. Most large steel yards will take it at steel rates.
C5B is a logical choice given the copper braiding around the case.
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