lapis → YInMn

LITUltramarine was ground from lapis lazuli (the blue mineral lazurite, flecked with gold-coloured pyrite) and was costlier than gold in Renaissance Europe. A synthetic version arrived in the 19th century. In 2009, Andrew Smith, a graduate student in Mas Subramanian's group at Oregon State, heated manganese oxide with yttrium and indium oxides to about 1200 °C and got YIn_1−xMn_xO₃, "YInMn blue". Its colour comes from Mn³⁺ in a trigonal-bipyramidal site, and it reflects near-infrared strongly.

MODELReflectance curves are logistic absorbers of my choice, not measured spectra. YInMn's In:Mn tuning is the slider (more Mn, deeper blue). The pyrite flecks are drawn with the measured Johnson & Christy gold reflectance as a stand-in for gold-coloured glints. Nesting: orange pyrite, purple veins, green copper traces, yellow-gold specks, the blue ground, the void.

more Mngrind lapis

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