Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
428 15, 501 12, 501 86, B32B 322, B32B 516
A jewelling and ornamental material comprising many amorphous silica spheres regularly arranged in a three-dimensional array and a zirconium compound filled in pores existing among the amorphous silica spheres, the amount of the zirconium compound being 0.005 to 8% by weight, as zirconium, based on the entire material; and a process for its production. This material has a play of colors inherent to natural opal, and excellent durability.
patent: 4090887 (1978-05-01), Marquisee et al.
"Hackh's Chemical Dictionary", 4th Edition; Grant, J., McGraw Hill Book Co., NY; pp. 736-737.
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