Thread: No proof but I believe this to be a very rare rose Thuringian

wow that is pretty nice. If it hones as good as it looks that is an amazing hone.

Hatzicho - that ordovician rainbow-hued thuringian is a fantastic looking specimen.

With my mystery paddle hone the red-brown/yellow-brown/orange spots seem to be due to a high ferric oxide content.

What do you ascribe the rainbow hues to in your stone? I know that oil comes from some ordovician strata - do you think it could related to that?

Regards,
Neil

Well Neil,

that's a question not easy to answer. There have been some examinations in the past concerning the chemical composition and color of different stratas of the thuringian stones in general. As for the devonian aged stratas as well as the ordovician stones in general the more darker colors gray to blue is caused by higher amounts of opake material, bitumen and ore. So your theory of oil occurance in the stone horizon is not far away.
On the other hand the ligther yellow and green colors belong to a higher content of mud in general, chlorite and leukoxen. The special purple and rainbow colors belong to trace elements that are found in the deposits, such as Ba, Cu and different sulphur oxides. So the rainbow colors are a mixture of all.

In general iron also ever occurs in higher amounts in the thuringian whetstone horizons, especially the ordovician ones.

Regards Peter

Originally Posted by hatzicho

Well Neil,

that's a question not easy to answer. There have been some examinations in the past concerning the chemical composition and color of different stratas of the thuringian stones in general. As for the devonian aged stratas as well as the ordovician stones in general the more darker colors gray to blue is caused by higher amounts of opake material, bitumen and ore. So your theory of oil occurance in the stone horizon is not far away.
On the other hand the ligther yellow and green colors belong to a higher content of mud in general, chlorite and leukoxen. The special purple and rainbow colors belong to trace elements that are found in the deposits, such as Ba, Cu and different sulphur oxides. So the rainbow colors are a mixture of all.

In general iron also ever occurs in higher amounts in the thuringian whetstone horizons, especially the ordovician ones.

Regards Peter

Wow it's a whole different language!