lelyea Posted October 1, 2012 Share Posted October 1, 2012 I hope I have enough information (not just a picture) for speculation on what it could be . . .It is very hard. I ran through 7 days of a vibrating polisher course grind grit with agate, etc - polished the agates and barely touched this stone. I attempted to grind it with an old lapidary wheel I have, in five minutes it ground one little spot (pic 00_stone3.jpg shows the spot) and a steel file won't scratch it. It will scratch quartz and agate - neither of those will scratch it.I found it in snorkeling in Lake Superior near Grand Marais approximately 8 miles from Agate Beach.If I had to describe the color I would say ox blood red.Weighs 120g and displaced approximately 50ml water (I was using a large measuring cup so not extremely accurate). I come up with a density of approximately 2.4 (am I doing that right??).Here is a picture of the stone:Thanks for looking! Quote Link to comment Share on other sites More sharing options...
Steel Pan Posted October 1, 2012 Share Posted October 1, 2012 I'm thinkin' Granite.Not positive, but that's my best shot, not being able to hold it in my hand. Quote Link to comment Share on other sites More sharing options...
lelyea Posted October 1, 2012 Author Share Posted October 1, 2012 I had considered granite initially MOHS 7 - but then when it wouldn't polish when agate and quartz did I thought it couldn't be granite. It will round a sharp quartz point in a single swipe.I am new to hard stone. Is there some reason granite in particular won't polish with items of the same hardness??I picked this stone up because it was rough and every other stone I was looking at was worn smooth by Lake Superior.Thanks. I'm here to learn. Quote Link to comment Share on other sites More sharing options...
boulder dash Posted October 2, 2012 Share Posted October 2, 2012 Looks like a red ranger skipping stone. You could get some top quality skips across any lake. No really you should trim a bit off with a trim saw and see what's in there. Quote Link to comment Share on other sites More sharing options...
adam Posted October 2, 2012 Share Posted October 2, 2012 When are the Rock Skipping Nationals? Quote Link to comment Share on other sites More sharing options...
Nugget Shooter Posted October 2, 2012 Share Posted October 2, 2012 Interesting rock and very hard to tell exactly from your photo, can you cut the end off? When you say it will not take a polish is it because the surface stays rough or chips away? Usually when a stone will not polish in the tumbler like you say it is either too soft or fragile. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.