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Description: | A specimen of the mineral fluorspar which is more commonly known as Blue John. The specimen has been cut and polished on one side. It has a layered appearance with alternating purple, white and yellow bands. The thickest band is the top purple one which measures 24mm and the thinnest is also a purple one measuring 2mm. The crystal structure can be seen in the white/clear parts of the specimen. The back of the specimen is covered in a pale brown fine grained matrix. AR/CB
A specimen of the mineral fluorspar known as Blue John | License: | http://creativecommons.org/licenses/by/2.0/uk/ | Publisher: | Sandwell Museums | Rights holder: | Sandwell Museums | Subjects: | Mineralogy Geology | Source: | Black Country History | Identifier: | http://www.blackcountryhistory.org/colle... | Go to resource |
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