K-feldspar - PL spectra K-feldspar Index IR-Reflectance Photoluminescence UV-Vis-NIR Orthoclase: Rainbow lattice sunstone (orthoclase) - 1.54 ct - Harts Range, Australia Sanidine: Gray sanidine feldspar - crystal - Uhuru peak, Mt Kilimanjaro, Tanzania Rainbow lattice sunstone (orthoclase) - 1.54 ct - Harts Range, Australia No spectrum Gray sanidine feldspar - crystal - Uhuru peak, Mt Kilimanjaro, Tanzania No spectrum
