Heavy Hunk of Rock

[calisdad]

A friend asked me to find out what I could about this specimen.
It weighs 21 pounds.
It displaces 6 cups of water in a bucket.
Dimensions are roughly 7" x 6' x 4 1/2".
It is magnetic but more so on the end that looks volcanic.
It came in a load of rock from the California Sierras.







Any ideas?
thanks-

 

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[silvermagnet]

any rock that looks volcanic is def not a meteorite