Two strange specimens

[isyon]

Hello All! I'm so glad I found this thread. Long time collector, first time poster. I live in Northern Middle Tennessee. I have a couple specimens I need help identifying.The first is a mettalic rock. Someone had guessed pet. Wood, but I'm not convinced. It in non-magnetic and does not leave a streak. I cut into the bottom and it has great luster. The second specimen is translucent and almost looks like a cave formation. Both were found in local creeks.

[earthnhands]

this is an old post but i think it looks like iron in sandstone...maybe petrified wood.
i wonder if the first one is a fossil...replaced by quartz. have you cut into it?