found a stone today. should I polish it? PIC!

[Rubycon]

Originally posted by: ironwing
From the picture it looks like either diabase or quartzite (two very different kinds of rock, hard to tell from the pic). If it is diabase it will not polish up as the softer minerals will wear down more than the harder minerals so that the rock will remain pitted no matter how much it is polished. If it is quartzite then it might be possible to polish it a bit, depending on how well recrystalized the grain boundaries are. To tell the difference, use a magnifying glass to look at the rock up close. If there are black or dark mineral flecks between the grains then you probably have diabase. The overall grain texture looks more like quartzite to me but my wife leans toward diabase (yes, we're both geologists).

If we had a streak we'd know.

 

[DaWhim]

Originally posted by: AdamSnow
I dunno... but that looks a lot like Toronto in the background

Edit : And that's what the weather looked like today as well around here...

you can actually see toronto in the background, just look farthuer. the first thought I had in there was if a giant antenna will enable me to stiff wifi from the city of toronto (31 miles across lake ontario).

 

[DaWhim]

Originally posted by: C6FT7
How big is your tumbler?

That rock looks fairly large.

new pic with measurement

palm size

 

[FrontlineWarrior]

it looks like a prostate