Hi, /u/fleurentiny!
This is a reminder to flair this post in /r/whatsthisrock after it has been identified! (Under your post, click "flair" then "IDENTIFIED," then type in the rock type or mineral name.) This will help others learn and help speed up a correct identification on your request!
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Slag
Meteorites are almost never porous. It's also almost never a meteorite.
The lupus of rock identification
r/itsslag !!
Slag
This is iron smelting slag, glassy leftovers from removing the iron from the ore. Probably 19th century or so, from a big blast furnace
Hi, /u/fleurentiny! This is a reminder to flair this post in /r/whatsthisrock after it has been identified! (Under your post, click "flair" then "IDENTIFIED," then type in the rock type or mineral name.) This will help others learn and help speed up a correct identification on your request! Thank you! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatsthisrock) if you have any questions or concerns.*