I'm kind of stumped. I associate that kind of pattern with quartz. I have amethyst quartz with similar patterns. When the pattern is that sharp it's referred to as chevron or sawtooth amethyst.
Lace Agate has a much milder, more lineal pattern to it, white Crazy Lace Agate has wild patterns and tends to have more variance in color. Is the color a pinkish brown because that's what I see on my monitor? Amethyst Citrine and clear quartz can all appear in the same hunk of quartz and create some interesting variations of color, but ametrine doesn't really look like that. Maybe it's some kind of Rose Quartz is all I can think of
