As far as I know there’s only one shop in downtown Santa Fe where you can get these, as cabs, under the extremely made-up name “talaverite”. I couldn’t figure them out for years: weird sedimentary-looking deposit but very hard and takes a high polish; not dyed but those colors in that combination can’t possibly be natural.
If you catch Forrest on a good day, though, he’ll show you one of the roughs he cut it from, with a fossilized 1/4″ bolt partially sticking out. They’re glaze deposits mined from a Mexican tile factory, like Fordites but stony and earthtoned. Aside from looking cool as hell if any magic inheres in stones it’s from the small genre of gems pulled not from the bowels of the earth but from delves into the guts of longrunning heavy industry.