Where to Find Chalcedony in Texas

Texas chalcedony tracks the same Trans-Pecos volcanic belt that produces the state's agate. Brewster and Presidio counties yield red, pink, and white chalcedony in the Tascotal and Mitchell Mesa tuffs, often as nodule rinds on plume agate. Marfa-area chalcedony runs softer and pinker; Big Bend chalcedony is harder and more saturated. Smaller showings of milky and gray chalcedony turn up in the Llano uplift of central Texas. Most ground is on private ranches that run dig days; trespass on Texas ranchland is prosecuted aggressively. Coastal Texas adds occasional chalcedony beach pebbles along the Padre Island shoreline.

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

Open the full map

Every chalcedony spot we track in Texas

Best spotDavy Crockett National Forest (Ratcliff Lake)Houston County, TexasPublic access · Petrified Wood, Agatized Wood, Jasper +2
Quitman Mountains (South)Hudspeth County, TexasPublic access · Agate, Amethyst, Carnelian +3
General AreaBrewster County, TexasPublic access · Moss Agate, Plume Agate, Chalcedony +2
W side of Glass MountainsBrewster County, TexasPublic access · Moss Agate, Plume Agate, Chalcedony +2
Btwn Groveton & TrinityTrinity County, TexasPublic access · Agate, Chalcedony, Jasper +1
Eagle PassMaverick County, TexasPublic access · Agate, Amber, Chalcedony +1
LopenoZapata County, TexasPublic access · Agate, Agatized Wood, Chalcedony +1
Rio Grande River AreaWebb County, TexasPublic access · Agate, Agatized Wood, Chalcedony +1
Terlingua CreekBrewster County, TexasPublic access · Amber, Agate, Chalcedony +1
Chinati MtsPresidio County, TexasPublic access · Agate, Chalcedony, Jasper
H.D. House Ranch areaLive Oak County, TexasPublic access · Agatized Fern Bud, Jasper, Chalcedony
Marfa and Ft. DavisJeff Davis County, TexasPublic access · Agate, Chalcedony, Jasper
Rio GrandeStarr County, TexasPublic access · Agate, Chalcedony, Jasper
Hinton CreekSan Saba County, TexasPublic access · Chalcedony, Chert

Standout chalcedony spots in Texas

Hand-picked from the full list above, with the reason each one earns a trip.

Davy Crockett National Forest (Ratcliff Lake)
Houston County
The Davy Crockett National Forest sits in the petrified-wood belt of East Texas, where silicified and agatized wood weathers out of Catahoula and Manning Formation gravels alongside jasper and agate.

Best counties for chalcedony in Texas

Ranked by the number of mapped chalcedony spots. County links open the full rockhounding page for that county.

Brewster County3 spots
Houston County1 spot
Hudspeth County1 spot
Jeff Davis County1 spot
Live Oak County1 spot
Maverick County1 spot
Presidio County1 spot
San Saba County1 spot
Starr County1 spot
Trinity County1 spot
Webb County1 spot
Zapata County1 spot

Before you go

Read the chalcedony identification guide so you know what a keeper looks like in the field: Chalcedony in the encyclopedia.

Chalcedony in Texas FAQ

Where can you find chalcedony in Texas?+

The mapped spots concentrate in Brewster County, Houston County, and Hudspeth County. Known collecting areas include Woodward Ranch (Brewster County), Marfa volcanics (Presidio County), and Llano uplift (Mason County). Every spot on this page is on the map, and each spot's own page has its coordinates and access notes.

How many chalcedony spots are mapped in Texas?+

14 spots across 12 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.

Is it legal to collect chalcedony in Texas?+

Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 14 of the 14 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.

Where else to find chalcedony

More minerals to hunt in Texas

Hunt chalcedony in Texas with the map in your pocket

RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.