Name CHALCEDONY
Variety CHALCEDONY AFTER ARAGONITE
Origin Las Plumas (Chubut)
Argentina
Hardness 7
Composition SiO2
Crystaline sys. TRIGONAL
Size   7,6x5,8x4,5 cm
Weight 203 gr




Description:
In mineralogy, a pseudomorph is a mineral that appears in an atypical form, resulting from a substitution process in which the appearance and dimensions remain constant, but the original mineral is replaced by another. In this beautiful specimen, chalcedony "filled" a mould of multiple crystal twinnings of aragonite which had disappeared due to a previous geological process. (See also CBR003 and CLD005)


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CHALCEDONY



VARIETY CHALCEDONY AFTER ARAGONITE