MN-Nat

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03-14-2012, 01:52 AM
32t

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MN-Nat

My wife and I were out today checking out among other things the geology of the Mississippi river valley. I found a couple of neat pieces of stone and decided to make a hone. I was hoping to find the Glenwood formation but think I ended up with some Platteville limestone. Feel free to correct me as my geology knowledge is limited. I lapped it and gave it a go. I had trouble getting a good bevel with a King 1k and decided to give this one a try. 20 x's later it was popping hair. Having fun and haven't decided if or where it can fit in.

Tim
03-14-2012, 01:57 AM
xMackx

That's a pretty lookin stone, how soft/hard is it? Looks translucent to me, some type of metasediment?
03-14-2012, 03:13 AM
32t

Quote:

Originally Posted by xMackx

That's a pretty lookin stone, how soft/hard is it? Looks translucent to me, some type of metasediment?

It is sort of translucent when wet. It has a hardness about 4 on the Mohs scale. Comparing to my C-12k with a hardness of less than 3.
03-14-2012, 03:41 AM
xMackx

Looks like I got another whetstone hunting buddy. One thing I learned that really help narrow down my search for whetstone material is any type of rock that makes great whetstones will be either sedimentary or metasedimentary. Metasedimentary rock is sedimentary rock that has gone through a light metamorphosis through heat, pressure, or mineral absorption. It was kind of confusing when i first started to read about the origins of different whetstones, because it would say either this type of whetstone is sedimentary or metamorphic not accounting for it actually being a subgroup of the two.
03-14-2012, 05:10 AM
rodb

Very cool!! I'm up for hone hunting anytime!!
03-14-2012, 01:30 PM
SharpMan

Quote:

Originally Posted by 32t

It is sort of translucent when wet. It has a hardness about 4 on the Mohs scale. Comparing to my C-12k with a hardness of less than 3.

How did you test the hardness?

Sharpman
03-14-2012, 02:01 PM
MODINE

You never know what you can find just by looking down he,he. Depending on where the stone was found in your region, it could have come from a layer of fine silicate ash that was deposited a long time ago. Good luck and have fun testing your stone.
Large Volume 18O-depleted Rhyolitic Volcanism: the Bruneau-Jarbidge Volcanic Fie ELE (Extinction Level Event): Supervolcano (Bruneau-Jarbidge Caldera)
MIke
03-14-2012, 02:14 PM
32t

Quote:

Originally Posted by SharpMan

How did you test the hardness?

Sharpman

1. Testing Hardness of a Mineral
03-14-2012, 04:05 PM
rodb

How did you lap that?
03-14-2012, 09:54 PM
32t

Quote:

Originally Posted by rodb

How did you lap that?

60 micron film and about 1.5 hours of elbow grease. This was the smoother side and the other had that nice looking rind on it. I should have cut it smooth at first but it would have took me longer to dig out and start my saw.
03-14-2012, 10:50 PM
thebigspendur

If your in MN go next door to Wisconsin and to the Devils lake area. They have Quartzite peculiar to that region alone. Purple stuff. I've always suspected it could make a great medium grit hone. I have a chunk but it's too irregular and small to be of much value as a hone.
03-15-2012, 02:42 AM
32t

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I did a search and it looks like it wouldn't be to hard to get a hone size piece. It is not real close but certainly in range.

Thanks, Tim
03-15-2012, 03:17 AM
rodb

Quote:

Originally Posted by 32t

I did a search and it looks like it wouldn't be to hard to get a hone size piece. It is not real close but certainly in range.

Thanks, Tim

Ok, I'll hold the rope, you go up there and get the hones
03-15-2012, 03:33 AM
rickboone

Cool, I want a MN nat. keep us posted to your tests.
03-15-2012, 04:55 AM
32t

Quote:

Originally Posted by rodb

Ok, I'll hold the rope, you go up there and get the hones

Just below her left foot and a little to the right looks like a good hone size rectangle!:rofl2:
03-15-2012, 08:54 AM
Vasilis

Nice one! Looks like a Jnat nakayama karasu :p. I have also find a few weeks ago an extraordinary piece, it's actually marble, but it contains very very fine quartz particles, strange thing. I'll open a thread when I'll be able to lap it to an acceptable degree. Hone hunting is fun.
03-15-2012, 10:43 PM
32t

2 Attachment(s)

I found the Glenwood formation

Today on another walk I found the Glenwood formation!

I had a hard time getting a big enough piece for a hone. I lapped 2. They are very soft and brittle. The larger one you can see I lapped sideways to the layers. The one side has many inclusions. Not good. the smaller one is much more cleaner but still has a few inclusions. That one is crumbling on one end. I don't know if it is from lapping under running water or from it drying out. At least when it is damp I could bevel the edges with my pocket knife. Lapping with sandpaper the clay or silt in it would create a suction between the stone and paper if not enough water used. I haven't used it yet except a few test strokes on my pocket knife but it seems about the coarseness of my 220 norton.

I an going to let them sit around for a while to stabalize. I think the main issue is going to be that they are very fragile. Even if the abrasive qualities are good.

Tim
03-16-2012, 12:42 AM
xMackx

2 Attachment(s)

Good work Tim, those look like great candidates. Is that a soft type of siltstone? I know what you mean when trying to get a big enough piece. I'm waiting for it to get warmer because the bigger pieces are under water. It's been hot the last couple days here for this time of year, I'm getting excited.

This is the siltstone I'll be sending out to ya when I get more. It's pretty hard for siltstone actually. I've gotten shaving edges off it and it seems to cut really well. I had it laying around for awhile because without being cut and lapped it looked really gritty. Let me know how those new stones preform, keep up the good work! :)
03-16-2012, 03:47 PM
thebigspendur

1 Attachment(s)

This is what the Devils lake Quartzite looks like from the Baraboo Range.
03-17-2012, 04:13 AM
32t

The Glenwood formation experiment was a bust at least as far as a hone goes. It is way to soft. I did try a slurry from it on my C12kand that was interesting enough for me to try again. I did get in a couple of good walks and more learning!

Tim
03-19-2012, 04:19 AM
xMackx

1 Attachment(s)

Just wanted to show ya what i worked on this weekend Tim. This one wasn't as uniform in color as I wanted but it seems to work pretty good, but this was the biggest piece I could find at the moment. It's pretty darn hard for siltstone, spent several hours lapping it and I'm not quite done yet.
03-19-2012, 04:25 AM
rodb

There's old slate mines south of Duluth, I'm going up there sometime this spring/summer and check it out
03-19-2012, 04:38 AM
HNSB

Quote:

Originally Posted by rodb

There's old slate mines south of Duluth, I'm going up there sometime this spring/summer and check it out

If you want a digging partner, let me know...
03-19-2012, 04:48 AM
rodb

Quote:

Originally Posted by HNSB

If you want a digging partner, let me know...

Sure!!
For those in MN here's the geology map of MN http://www.lakesuperiorstreams.org/u...eology_map.pdf