Need Rock ID

[undertaker]

I found two of these rocks when I was arrowheading in a cornfield here in Vermont. I have never seen anything like them. They are light baby blue with a mix of dark blue and pitted with rust color deposits. They are glassy looking so at first I thought they were melted glass, but upon a closer look the are not glass and more rock like. Anyone come across this rock before?

 

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[undertaker]

pic 2

 

[undertaker]

pic 3

 

[irbaddadjoe]

Could be Turquoise.

 

[double barrel]

that's interesting. have you tried one of those small light things to see what color or how dense it is?

 

[double barrel]

go to cosmic this page

 

[TreasureTales]

Hmmm, I'm thinking maybe chalcedony.

 

[bakergeol]

My guess is that your initial impressions are correct. Appears glassy looking. It appears to have small holes or pits. This adds up to something man-made out of a furnace. I would go with slag.

George

 

[Eu_citzen]

Reminds me of rough opal.. Turquoise is also a good guess, hardness would be great to know opal is about 5 (about same as glass)
Turquoise is around 5-6 as well.

http://en.wikipedia.org/wiki/Image:Turq_mcGuin_bunker.jpg
Shows (rough) Turquoise.

 

[Old Dog]

Just so look at them without further info I must agree with TT.
Calcedony Is a quartz mineral with globular melted looking forms.
Forms in layers and comes in Many colors.

OD