Celestine (mineral)
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Celestine or celestite is a mineral consisting of strontium sulfate. The mineral is named after its occasional delicate blue color. Celestine and the carbonate mineral strontianite are the principal s
Clear grey-blue celestine crystals
Celestine from the Machow Mine, Poland
Celestine mineral on display at Yale's Peabody Museum
Celestine geode section
Geode
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A geode is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter are secluded.
Celestine (mineral)
…mechanism of celestine precipitation. It is sometimes used as a gemstone. Celestine crystals are found in some geodes. The world's largest known geode, a celestine geode 35 feet (11 m) in diameter at its widest point, is located near the village of Put-in-Bay, Ohio, on South Bass Island in Lake Erie…
Quartz-filled geode, shown from inside (top) and outside (bottom)
Reddish chalcedony geodes
Very large amethyst and regular quartz geodes