Thread: 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

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

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.

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.

Very cool!! I'm up for hone hunting anytime!!

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

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

Originally Posted by SharpMan

How did you test the hardness?

Sharpman

1. Testing Hardness of a Mineral

How did you lap that?

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.