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Measurements: 43 x 32 x 25 mm Description: A thin layer of
sparkling, minute crystals of blue chalcedony, sits on blue
lace agate and
greenish calcite. The chalcedony has a few
small nicks on the top, while the edges of the specimen are damaged. Weight of Specimen: 44.5 g Chemical Composition: SiO2 (quartz)
Hardness on Mohs Scale: (quartz) 7 Location: Ysterputs mine, Specimen Code: US $ 17 . . .
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