Very interesting, chert must have been what I found back in the mid-1970s that worked so well for so long in my flint rifle out here in Colorado. I looked it up just now and the light color makes me think all the more it was chert.
"Chert and flint are microcrystalline varieties of quartz. ... The only difference between chert and flint is color: flint is black or nearly black and chert tends to be white, gray, or pink and can be either plain, banded, or preserve fossil traces."