This is a gorgeous new stone from Turkey. Although it has been around for a little while, there was originally much confusion over its composition and, indeed, over what to call it !
The blue and the white bands are Calcite and the brown/cream/grey lines or areas are Scheelite - so you could assume that this stone was going to be called Scheelite in Calcite.
However, the people who first brought it to the market wanted to get it out there and assumed (incorrectly) that is was Lapis Lazuli in Onyx and so decided to sell it as "Lapis Lace Onyx".
Unfortunately, that was a really catchy sounding name and it has rather stuck - even though it has not a trace of Lapis Lazuli nor any Onyx in it at all !
Not withstanding any of this - this is still a wonderful slice, polished all over, and with the lovely blue and white wavy pattern that is just so typical of this stone.