Any idea what this lime green stone is?

[mistamista2000]

I live in Maryland and while raking leaves in my yard I came across this buried halfway in the ground. From the odd shape and cut its definitely not glass and there is no transparency. It's a light shade of lime green in color. Any idea of what it is?

 

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[Oddjob]

Heck of an odd thing to find in the yard.

 

[ARC]

Nephrite jade birds head ?

 

[Eu_citzen]

Do a hardness test. With quartz. Pic of the other side?

 

[mistamista2000]

Do a hardness test. With quartz. Pic of the other side?

 

[unclemac]

could also be some pale onyx ....why did you decide it was not slag glass?

 

[Eu_citzen]

Slag glass typically has "bubbles" in it. However there are exceptions and then it gets tricky.
"Common" opal could be a candidate, to.

Was a hardness test made?