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Cinnabar on Dolomite
Calcite (nailhead stalactite) from Hilton Mine, Cumbria
Titanite with Clinochlore......l
Rhodochrosite with Pyrite and Sphalerite
Goethite - Spain
Calcite / Craigs Quarry, Ballymena, Ireland
Boytroidal Chalcedony. Botryoidal (grape-like) structures manifest internally as "turtle-backing" or sometimes externally as "bubble-top" surfaces.