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Ok after all that was said i found two source's one from timbertools and one from the srp wiki i'll quote the srp wiki "The stones made by the Escher & Sohn company, produced from 1709 to the early...

this is why i love this forum we all want to know more about the same thing a think tank for razors and rocks. i found alot of info on wikipedia look up shale and look up slate they are both made of...

you know what kingfish you mite be on to something i cant find much info on the internet about thuringians but shale is a fossilized clay and slate is the metamorphosis of clay,shale. so if the two...

i'm not saying it's a piece of slate it was just my first impression of the stone . now your link to the Thuringian Slate Mountains doesnt tell me anything about thuringian stone's just that they...

lol thuringian arent slate. Slate is metamorphosed shale and is composed of micaceous minerals, and could contain quartz, calcite, dolomite, feldspar, pyrite, rutile, graphite, chlorite, and other...

looks like a piece of slate ,but more pic's are needed to have positive I.D