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I don't know what is CF, but the stone is really hard. Very difficult to lap? Especially the bigger one.

Size of bigger stone - 8' x 1' and 6/8 x 1', smaller one - 6' x 1' x 1/2. Both stones are very hard to lap, they have small scratches, which are very difficult to remove. Smaller stone on wooden...

Bought two stones recently, can't identify them. May be somebody can recognize them. On the attached photoes two stones; dry, wet, semiwet