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Rhodochrosite with Pyrite and Sphalerite
Titanite with Clinochlore......looks like a frog on the side of the rock
Goethite - Spain
Amethyst Amethystine Flower Hallelujua Amethyst Irai - 3 by FenderMinerals, via Flickr
The Phantom Crystal
Rhodochrosite with Quartz & Pyrite
Boytroidal Chalcedony. Botryoidal (grape-like) structures manifest internally as "turtle-backing" or sometimes externally as "bubble-top" surfaces.