Renovation, identify tile type, ~1960, dangerous?

Hello everyone,

we are currently renovating our basement apartment. We are laying new parquet over the old tiled floor. However, we want to remove the skirting boards, which are also made from tiles. The tiles somehow seem unsatisfactory to me in terms of their condition. They crumble easily and look unusual. I have already sent the tiles to the lab for an asbestos test, so I can rule out asbestos. Does anyone know this type of tile? Do you think removing the tiles is harmless?

Here are two pictures of the tile:

Thank you very much for your help!

These are very strange photos if it is supposed to be the same tile both times: Image 2 looks brownish, smooth, and more like stoneware; Image 1, on the other hand, shows a break that is black and does not look like a tile at all, but rather like a slate plate.

I can't make sense of your photos: In the second one I see a square reddish-brown glazed tile, In the first one I see wood and slate. How does that fit with your description?

The first and second image show the same tile. In the first photo only in a broken state and on a wooden surface because the lighting was better there... The behavior actually resembles a painted slate tile. But I only know slate as a more expensive material. Why would one use this for the production of tiles if the surface in the end is not supposed to correspond to that of slate at all? I was just concerned that it might be some kind of hazardous substance, as I had never seen such a tile before.