I dug up some sand and small rocks in a stream bed near me and moved a powerful magnet through the wash picking up numerous small rocks and black sand.
Now, the black sand is definitely small crystalls of magnetite, but what about the small rocks which tend to be gray in color, some being brownish?
I thought pretty much anything you would be likely to encounter commonly (like in a stream bed) that is magnetic is magnetite. In other words, my understanding is that the only COMMON mineral that is magnetic is magnetite. But these small rocks do not appear to be magnetite crystals, and the brown ones definitely are not.
Does this mean there are magnetite crystals INSIDE the rocks? Like if I break them up will I find little tiny magnetite crystals within?