Thread: Are these Thuringian Hones?

Dear Straight fans,

please help me identifying following 4 stones.
All of them are very fine, I've some idea but I've recently learned that identifying hones is not that easy.
Please have a look and confirm or share your opinion.

Thanks in advance

Stone Nr1.
Dimensions (not exact): Length: 17cm, Width: 4cm, Height: 5-8mm
The stone looks gray with a little bit of green with mottled surface, has a red/broun big inclusion.
Stoneis relativeley hard and gives gray/brounisch slurry. Middle of the backside is quite dished out (guess it was the front side before )
My guess: (grey) Schwedenstein?



Stone Nr2.
Dimensions (not exact): Length: 15cm, Width: 3cm, Height: 16mm
Hone is of grey/green color and composed of 4 layers running diagonal through it: dark - medium - light - medium. Quite soft, gives grey-greenisch slurry, I've a feeling that it generates some auto-slurry. Surface feels very smooth to the fingers, has some inclusions in form of lines/dots.
My guess: Yellow-Green/Blue Thuringian?



Stone Nr3.
Dimensions (not exact): Length: 12.5cm, Width: 2.5cm, Height: 14mm
Appears dark-grey, has some brounisch/grayisch looking lines and inclusions.
Surface feels very smooth to the fingers (same as Stone Nr.2), produces light grey slurry.
On the backside ther is som (organic?) spot and the surface has some green in it.
My guess: Blue Thuringian?



Stone Nr4.
Dimensions (not exact): Length: 14cm, Width: 3cm, Height: <=7mm
Hone appears black-mottled with dark-grey lines, visible when wett in the sunlight.
The stone must have been used to sharpen fisher hooks which has leaded in terribly groves on both sides. I've lapped one side significantly down to get a flat surface.
Produces medium-grey slurry.