except for stuff lik chondrites or pallisites, all meteorites should be magnetic with that "all over" fusion layer that indicates its been tooling around in space and then entering our atmosphere.
That "travel itinerary" often makes some funky blackened raction surfaces and shapes. Yours demonstrates a "crystalline habit". Thats NOT a mteoritic habit. Since its not iron-rich, those crytals need to be analyzed as to mineral content. Salisbury had depoits of tin that was used to make the ancient "Doggerland" , a point of trade during the metal ages. It may be something like cassiterite but it need a close in look by a uni geology student who can pop it under a mike or better, an Energy dispersive Xray . This can easily be looked at and not sacrifice any part. I dont like to damage any obvious crystal faces on a sample