ID help needed on this green and black veined stone

[woodwrightman]

I now somehow have 2 of these stones and have not been able to find any information on them anywhere. I would say they are rather like the DT in feel and grit, but not the finest finishers, but nearly there.
Stones have been lapped and the slurry is shown dry and wet and some detailed shots. The colour is accurate on my computer. They work very well with water and have not tried with oil