Fly Gap Road pegmatites: Amazonite & Feldspar Rockhounding in Mason County, Texas

Plan your visit

Generally open to casual rockhounding

County

Mason County

State

Texas

Nearest road

Fly Gap Road

Coordinates

30.87332, -99.04397

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Best time to visit Fly Gap Road pegmatites

Comfortable months (45 to 90°F highs)

Best months: September to May. Typical highs run 95°F in midsummer and 61°F in midwinter, with winter lows near 34°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, MASON station (14 mi away).

Geology at Fly Gap Road pegmatites

This spot sits on Valley Spring Gneiss, mapped as paragneiss that formed roughly 2500 to 540 million years ago. Metamorphic terrain like this typically carries quartz veins and sweats, and weathered crystals tend to end up in the soils and streams below.

Mapped unit

Valley Spring Gneiss

Age

2500–540 Ma (Proterozoic)

Rock types

paragneiss

Elevation

1,550 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

State guidance last verified: April 1, 2026

• Texas Parks and Wildlife Department
• Bureau of Economic Geology, Texas geology
• Big Bend National Park, Rules
• Community submissions reviewed against published agency rules