Excellent pictures, and very helpful.
For the question "could the silvery-white blobs be the source of the magnetism?" then the answer is "yes, they could" but it's not the only possibility. And even if they are, this doesn't mean you have a meteorite. For the question "is this a chondrite?" my answer would still be that the general appearance is not typical for a chondritic meteorite and your great pictures only serve to underline that there are no apparent features with the characteristic rounded appearance of chondrules.