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Stellerite : Ca4(Si28Al8)O72·28H2O

 
 
minID: TRG-2UN

Stellerite : Ca4(Si28Al8)O72·28H2O

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Stellerite from the Vulcan Manassas Quarry. These have been analyzed and the differences between these and the stilbites for this locality documented by Dr. Lance Kearns at James Madison University.

Approximately 6 cm along the longest edge.

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Photo added: 18th Mar 2012