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Mine is the same. Apparently they are Schwedensteins, from a mountain in Saxony, Germany. So a 'cousin' of Thuringians. Very similar.

And then?

Mine makes a slurry of the same consistency as my Thuringian and Escher, however it has a brown tint to it, where as the others are pretty much white with a hint of grey.

Have you a picture of the slurry?

This is what I believe is a Brown Thuringian. Although the base colour on mine differs, it has those similar orange/pink markings. An authority on hones has used mine and believes it to be a...