What stone is this?

[jacobsen]

A white streak appears on the rock - could this be a gemstone or the compression of a bottle or something?


there is also small stains of yellow

 

[2Neezers]

I’m not an expert, but it looks a lot like a slag rock to me. There is a Facebook group called “Rocks, Fossils & Minerals Identification” that would most likely be able to help you identify it.

 

[Ionysis]

Perhaps Malachite?

 

[fredflintstone]

Did you find it in an area rich with copper?