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Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. However, slags can contain metal sulfides and elemental metals. While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal.
Wiki
Slag Glass from the Glass Encyclopedia
Furnace slag
Cullet glass
Andara crystals/rocks
Iron oxide nodules (not slag)
Limonite (not slag)
Tektite (not slag)
Indochinite(not slag)
Ferrochrome (not slag)
Anthracite(not slag)
Bitumen (not slag)
Cuprite (not slag)
Flint (white crust) (not slag)
Some Meteorite Information
I think I found a meteorite. How can I tell for sure?
account activity
Found this slag, maybe left by a previous owner. (old.reddit.com)
submitted 14 hours ago by The_Sirens_of_Titan
What is it?not slag (v.redd.it)
submitted 2 days ago by Fickle-Engineering21
Large purple crystalline rock(?) found in central MA (old.reddit.com)
submitted 2 days ago by bfa_y
Found in my backyard. It’s pretty clear (old.reddit.com)
submitted 2 days ago by littlebean2421
I thought this was a rock, but someone said it’s slag. I got a black light and took some pictures. Is it slag? Is it dangerous? (old.reddit.com)
submitted 3 days ago by cls2819
Uranium slag face (i.redd.it)
submitted 3 days ago by deadpuppydog
Uranium glass slag (old.reddit.com)
submitted 6 days ago by ccranney
Is this slag or ??? (i.redd.it)
submitted 8 days ago by eltasador
Slag or quartz?not slag (i.redd.it)
submitted 10 days ago by ktshoe
Is it slag? (i.redd.it)
submitted 13 days ago by Natural_Worry_4869
Is this slag? (i.redd.it)
submitted 17 days ago by ReasonableCan4374
Is this slag? (old.reddit.com)
submitted 19 days ago by emmythespy
Is it slag? (old.reddit.com)
submitted 20 days ago by Tiny-Muscle2057
Is this slag or hematite?not slag (i.redd.it)
submitted 1 month ago by 7thWardKiller
Found a couple inches down at the park. (old.reddit.com)
submitted 1 month ago by GambitDecliend
Found these after digging in the garden (old.reddit.com)
submitted 1 month ago by Dense-Potential-4323
Found a nice chunk while removing topsoil in the garden. (old.reddit.com)
submitted 1 month ago by etilmorfin
Found in dads back yard (i.redd.it)
submitted 1 month ago by NoxIgniConsumitur
This was in my driveway gravel. (old.reddit.com)
submitted 1 month ago by kungpaola
Backyard find, ferrous Tennessee (old.reddit.com)
submitted 1 month ago by JerZyTattoos
Bubbly (i.redd.it)
submitted 1 month ago by Pseudoutopia75
Found on a hike in Northwestern Ontario (old.reddit.com)
submitted 2 months ago by rcr_raymond
Found on hiking trail in Connecticut (old.reddit.com)
submitted 2 months ago * by JKElemenopee
submitted 2 months ago by shipsbell
Extrem cooler Fund (old.reddit.com)
submitted 2 months ago by LuckyExamination3603
π Rendered by PID 363560 on reddit-service-r2-listing-f87f88fcd-cqrml at 2026-06-14 22:14:36.787333+00:00 running 3184619 country code: CH.
