What the heck is this!?

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Jun 12, 2020
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Hi everybody,

New to the site. I found this rock in my backyard. Can anyone help identify what it is? I have no idea. Is it worth something? Are there gems inside?

Area - Sydney (Inner West)

Any help would be much appreciated.

1591887209_57f6bbd0-5e8e-4f4c-a457-5c76e0d58011.jpg

1591887210_8e505985-bcdc-4737-a455-9e27e3a1b0c3.jpeg
 
Hard to tell from that photo but possibly malachite , does it have any spherical / curved bits on the other side ?

Malachite can be polished for jewellery but not something of value sorry.

There is a few geotechs here who will post when they finish wiping the dribble of egg yolk off their chin :)
 
Most probable slag , the fluxes , Borax etc ., look like glass .

Many years ago I did see an electric arc furnace in Marrickville ? Even in those days it surprised me , right in amongest the shops . He was a scrap metal man . He had bought it auction as they could not pay the import duty for the furnace .
 
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