from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A blue
mineralwith monocliniccrystals, Ca4( Al, Fe3+, Mg, Fe2+)10 Si12 O35(O H)12 CO3·12H2O.
Sorry, no etymologies found.
Vendrell, who says it could not be any other kind of blue pigment used in Romanesque murals, such as azurite, lapis lazuli or aerinite, "which in any case came from far-off lands and were difficult to get hold of for a frontier economy, as the Kingdom Aragon was between the 11th and 15th Centuries".