Where to Find Agate in Texas

Texas agate concentrates in the Big Bend country and the Trans-Pecos volcanic belt of Brewster, Presidio, and Jeff Davis counties. Pompom agate, plume agate, and red moss agate erode from the Tascotal and Mitchell Mesa volcanics south of Alpine, with the Walker, Woodward, and Stillwell ranches running paid digs. Marfa-area agate (Mexican Lace, often called Laguna or Marfa Plume) carries dramatic fortification banding. Smaller showings of Balmorhea blue agate occur in Reeves County. Surface collecting on public land is essentially nil, since most agate ground sits inside private ranches that charge daily access fees; trespass on Texas ranch land is treated seriously.

Spot list checked against source data on April 1, 2026.