This piece (as most from Afghanistan) is best under fullwave (all three wavelengths - SW+MW+LW - 1st pic). Longwave brings out the beautiful orange color of the afghanite. Midwave makes the calcite really pop, and shortwave brings out the yellow phlogopite and white albite/gypsum. There is a very unusually bright yellow fluorescence that seems to be LW only - gotta wonder???
If I were to display it under only one light, I would probably pick MW, preferably with a LW “kicker”.