Specimens of scheelite (blue-white) and calcite (red-orange) glowing under shortwave ultraviolet. Field width 70 cm.

Partially collapsed timber inside old tungsten mine adit. Note black guano pellets.

Specimen of scheelite and calcite under shortwave ultraviolet. Width 25 cm.

Location of a large boulder of rich specimen material. Ground drops away sharply just beyond cactus.

Boulders recovered from location above. Photos taken in the field: left, camera flash; right, shortwave ultraviolet.

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