Unknown Blue

[Cariboo5]

Rock looks volcanic. Turned it over and in the sun light this nice aqua and dark blue spot showed itself. Have no idea what the blue is. Comments appreciated.

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[diggingthe1]

Looks like chert of Jasper or some agate type of rock. Formed after the rock hydrothermally. That's just my guess. Probably would look great slabbed but I don't know if it would be worth it. Nice rock.

 

[wilfndgold1]

Azurite, Copper stains maybe. Pretty cool though.

 

[Cariboo5]

Went back today and found this small piece with blue on it. Unfortunately this piece looks more like slag and I'm leaning more in that direction now. What a shame as the first piece is such as pretty blue..

 

[Capt Nemo]

Where at?

There's Leland Blue around Leland, MI which is a slag. There are blue agates around the Caribbean volcanos that has something to do with seawater seepage.

 

[Cariboo5]

Where at?

There's Leland Blue around Leland, MI which is a slag. There are blue agates around the Caribbean volcanos that has something to do with seawater seepage.

Central British Columbia Canada.

 

[Eu_citzen]

I'd do a hardness test with quartz. #1 doesn't look like slag. Rather volcanic.
My gut tells me opal, but my brain is more skeptic...