Materials are comminuted to -100 mesh and are assembled as a set in a handsome mahogany stained wood case with tiered shelves for accessibility. Each specimen is contained in a labeled glass screw-thread vial with a plastic screwcap closure.
This accompanying data is included for each glass or mineral (when available):
Cauchy Dispersion Equation Constants
Precise refractive index values (±.0.00005, in most instances) at seven common wavelengths
Technical Bulletin on Becke Line Refractive Index Method