Cavradi Gorge

History · Geology

About Cavradi Gorge

The Cavradi gorge in Val Curnera, Graubünden, Switzerland, is one of the most legendary alpine-cleft mineral localities on Earth — the global type-quality source of dark-blue anatase bipyramids and tabular brookite crystals on alpine quartz. Active collecting has continued for over 200 years.

Geology

The minerals form in alpine fissure veins cutting Permo-Triassic gneisses. Late-stage hydrothermal fluids percolating through the gneiss precipitate TiO₂ polymorphs, quartz, fluorite, adularia, and hematite at temperatures of 250-350°C.

Notable Minerals

Anatase (sharp dark-blue bipyramids — world-best, the species archetype), brookite (lustrous brown-amber tabular blades), rutile (sometimes oriented overgrowths on hematite “rose”), titanite, quartz (smoky and colorless), fluorite (rare pink octahedral), adularia, hematite (specularite roses).

Collector Notes

Cavradi anatase blades on quartz are the species’ aesthetic standard. The locality represents the European alpine-collecting tradition at its finest. Continued small-scale collecting yields new specimens periodically.