Are these for real?

[DIE HARD]

I was metal detecting near a old gemstone mine when I started spotting what seemed to be chipped up rocks of all shapes and sizes and colors. I've never found any kind of arrowhead before but I though these were pretty close so I brought them home.
After noticing them being filed down and struck several times I figured could actually be real so I returned the next day and found all this right below the surface I was wondering an approx date of some of these as they look to be made of machined glass? They were all found on a strange flat spot on the side of a mountain that overlooks an old lake bed.
If needed I can give more pictures answer questions etc thanks.

 

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[DIE HARD]

 

[DIE HARD]

Last picture is of sparkly blue obsidian

 

[RockinIdaho]

Wow! Those are nice!

 

[Jon Stewart]

You have some modern day slabbed up rock in that mix. My guess would be a modern day flint knapper was knapping and enjoying the scenery while doing it and left some material there. The blue sparkly stone/glass is man made and it was made in a variety of colors. I have some of that same "glass".

You also have some clear glass and brown glass which is probably the bottom of beer bottle or Clorox bleach bottle.

 

[capsmith]

Yep, modern day flint knapper. Take a close look at the pink saw slab. You can still see the saw marks . I have been knapping for more than 20 yrs , sorry ,but they are not. old.

 

[woodsman1981]

cool colors.

 

[monsterrack]

I'll have to go along with the other guys on a modern day knapper. You may have a site where there was a old N A quarry and modern day miners moved in on top of it. You will have to know what is old knapping or new by the weathering of the stone. That is some fine Obsidian.