Thread: Latest flea market Coticule

Found this at the flea market today, I about had a stroke. I don't know much about Coti's. So I am wondering what this black spots mean? I was thinking it has a different name or shows different quality when this are present in the layer? Please educate me of that is possible. Thankyou for your time,

Black spots or lines on a coticule are usually manganese deposits. Usually this will make the stone faster than usual ones. Try it with water and see if you get metal on the stone.

Old coticules are nearly impossible to identify by layer as they are no longer mined. I do like my old stones better, enjoy!

+1 on the manganese deposits

Thank you for the info. Sounds like I should probably keep this one for my collection.

The lines are probably manganese, the spots, I would guess are BBW leaching into the coticule. Lovely looking stone, try it out and see.

small spotted coti?

You must have lucky stars to thank, that's a beautiful piece of stone.

Black spots indicate that the hone is potentially poisonous. Whatever you do don't lap it or hone on it. Contact with skin or inhaling slurry can be hazardous to your health.

I happen to be SRP's poisonous hone disposal person. Wrap it carefully and send it to me for bio hazard disposal. This will cost you $3.00 + postage BTW .....

Originally Posted by AlanII

The lines are probably manganese, the spots, I would guess are BBW leaching into the coticule. Lovely looking stone, try it out and see.

manganese deposits !

Originally Posted by JimmyHAD

Black spots indicate that the hone is potentially poisonous. Whatever you do don't lap it or hone on it. Contact with skin or inhaling slurry can be hazardous to your health.

I happen to be SRP's poisonous hone disposal person. Wrap it carefully and send it to me for bio hazard disposal. This will cost you $3.00 + postage BTW .....

Jimmy may be correct but the biologic black spots are my department. I am told that razor fairies
do that to hones when the shaver fails to correctly dry and care for his razor. The compound if
you can call it that is kin to dog pee but much harder to clean up. Much harder to clean up than
Jimmies specialty but it can be detoxified in less than ten years. I can start the process as soon
as the hone arrives. I do charge more than Jimmy ... $3.50 + postage but you can get the hone
back in ten years if you remind me.

A geologist will tell you that it is an Iron-maganese mineral stain a lot like
the material on the image to the right here: Dendrite (crystal) - Wikipedia, the free encyclopedia
A variety of manganese oxides and hydroxides are possible.