✅ SOLVED Chrysoprase or Green Obsidian

[DanB72]

Glass slag, fluorite, utahlite, or chrysoprase

This has been in the family for years. We would like some ideas on identity. Please help. Here is what I know. Hardness is probably 6-7. It took force from a wood screw to leave a scratch.

 

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[HuntinDog]

CRYPTONITE

Sorry I couldn't help myself.
Don't know anything about rocks or minerals, But Cool looking rock.

 

[Indian Steve]

Does it have any air pockets? Looks like a nice piece of slag glass. Glass would have air pockets.

 

[DanB72]

Not sure it would be glass because of the way it fractures and the range of green colors. Wouldn't glass be a more consistent color.

 

[Chris in BC]

if it's as hard as you say, I would guess Nephrite, different from Jade but can have good value to some asian markets

 

[Chris in BC]

check the thinnest edge and see if backlight makes it translucent, interlocking fibers at microscopic level will be a dead giveaway. This character also makes it extremely tough to fracture with tools. Nephrite hardness 6.5

 

[BosnMate]

Obsidian is glass. Obsidian is not hard enough to strike a spark. I've seen green obsidian, and it wasn't near as pretty as what
you are showing. I don't think it's obsidian, other than that, I don't know what it is, except it's darn sure pretty.

 

[tamrock]

Hard to say for sure? ... It could be a piece of fluorite? They have a range in color, not sure of the range in hardness, link below has a similar looking specimen.
Uncut Unpolished Specimen Of Fluorite Crystal, A Calcium Fluoride.. Royalty Free Stock Photo, Pictures, Images And Stock Photography. Image 15488224.

 

[DanB72]

I was thinking fluorite as well, but it appears harder than fluorite. I'm leaning towards slag.

 

[DanB72]

Solved. Green common opal.