ROCKHOUNDING GRAY AREA DOCUMENTED
Where: Castilla-La Mancha · Europe · approx. 41.08, -3.0 (vicinity only)
Why this spot: Spain's 19th-century silver rush on epithermal veins in the Guadalajara hills
What turns up: pyrargyrite, freibergite, galena, barite, quartz
Access: Gray area.
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