K-feldspar - IR Reflectance 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 Gray sanidine feldspar – crystal – Uhuru peak, Mt Kilimanjaro, Tanzania
