Unusual polished rock

[shaman15771]

I started polishing a plain gold/brown colored rock last night appears to be some sort of sandstone? And when I put it on the diamond wheel where I polished turned blue. I light baby blue almost. Any one got any ideas or knowledge? Will post picture if necessary.

 

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[DDancer]

Picture would be good. Are you polishing it wet or dry? Some materials like topaz will change color when heated so the friction from a polisher may be altering the material a bit or the blue is from material lodging into the pores of the material.

 

[shaman15771]

Polishing with a diamond wheel on jool tool. Polishing it wet, though not really necessary as jool tool is air cooled. Will get some pictures up. Actually, it's really cool looking.

 

[Las Vegas Bob]

Did the surface of the polishing wheel turn blue or did the surface of the rock turn blue? Just curious.

 

[shaman15771]

The rock, wheel impervious to that except for a bit of dust. Will get some pictures.

 

[Las Vegas Bob]

The rock, wheel impervious to that except for a bit of dust. Will get some pictures.

Thanks for the reply. If your using a diamond wheel on sandstone your probably make glass out of the silica content just from the friction, if it is in fact sandstone,