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Celestite Cluster

Regular price $51.00 USD
Regular price Sale price $51.00 USD
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Stunning Celestite Geode gemmy cluster with outstanding clarity. Some of the points are so clear they look like glass, the color seems to be more saturated under lights due to the clarity and lighter in regular room lighting, due to this the color appears a little darker in the pictures than in person, the color in the pictures has not been adjusted.

Approximate Measurements: 2.95" x 3.58" x 1.90"

Weight: 15.1 oz (426g)

Celestine occurs as crystals, and also in compact massive, and fibrous forms. It is mostly found in sedimentary rocks, often associated with the minerals gypsum, anhydrite, and halite. On occasion in some localities, it may also be found with sulfur inclusions.

The mineral is found worldwide, usually in small quantities. Pale blue crystal specimens are found in Madagascar. White and orange variants also occurred at Yate, Bristol, UK, where it was extracted for commercial purposes until April 1991.

The skeletons of the protozoan Acantharea are made of celestine, unlike those of other radiolarians which are made of silica.

In carbonate marine sediments, burial dissolution is a recognized mechanism of celestine precipitation. It is sometimes used as a gemstone.

Celestine geodes are understood to form by replacement of alabaster nodules consisting of the calcium sulfates gypsum or anhydrite. Calcium sulfate is sparingly soluble, but strontium sulfate is mostly insoluble. Strontium-bearing solutions that come into contact with calcium sulfate nodules dissolve the calcium away, leaving a cavity. The strontium is immediately precipitated as celestine, with the crystals growing into the newly-formed cavity.