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An artifical material created for carving/lapidary purposes. Contains a mixture of calcite, plastic and artifical colouring pigments (PB15, an art-supply pigment), and a paraffin-like material (Kiefert, 2003).
Although suppliers claim it to be a natural stone, tests have indicated that it is probably powdered carbonate rock artificially coloured and then stabilized with plastic.
Visit gemdat.org for gemological information about Rainbow Calsilica. Currently in public beta-test.