Llano County

Llano County sits at the heart of the Llano Uplift, a dome of exposed billion-year-old Precambrian granite, gneiss, and schist in the Texas Hill Country — the geologic source of Texas blue topaz, named the state's official gemstone in 1969, and llanite, a distinctive blue-quartz granite found nowhere else in the world. The Llano River cuts through this uplift, carrying granite, gneiss, schist, garnet, and quartz gravel through the county. Unlike neighboring Mason County, whose pay-to-dig topaz ranches (Bar M, Seaquist, Lindsay) are locally famous, Llano County's own producing ground — river gravels and pegmatite outcrops like the Rode Ranch locality — is essentially all private property, with no organized public-access dig operation found.

Llano, the county seat, sits at the junction of US-87 and TX-16, with the Llano River running through town. No public trailhead or fee-dig operation was found for topaz or zircon collecting within the county itself.

General-area inference: where accessible, river-gravel panning and screening can turn up topaz, and pegmatite outcrop picking is the method for zircon — but essentially all producing ground here is private ranchland, so any collecting depends entirely on landowner permission rather than a walk-in public site.

All known Llano County sites for topaz and zircon sit on private property; no confirmed public fee-dig operation exists in the county, in contrast to Mason County next door. Contact landowners directly before attempting to collect anywhere in the county — don't assume Mason County's ranch-access model applies here.