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i think it says F.C AND B.C.
WILL check tomorrow exact name. got to do some digging.

If it walks like a duck, and quacks like a duck, it's probably a duck?
I assume some president said this.

My enemy isn't far away next to my dining table.

both middle stones does have exact label and on side of the stone says in English 'VERY FINE"(they are different colors brown and wet asphalt)
THE information above which comes from Vosges mountain...

this may help. if not then i may end up making another pics.
label doesn't say Brown escher.
Most of them called thuringian and escher just one branch of it.
this stone doesn't have name lets say...

I THOUGHT TO make separate thread then decide not to do so.
from left to righ
BARBER'S delight y/g
Barber's delight y/g
Yellow green regular size
light green 8 1/5
light green 10 inch
brown...