Scapolite Group Visible Spectra (350 - 1100 nm)

The scapolite group minerals vary from marialite, Na4Al3Si9O24Cl, to meionite, Ca4Al6Si6O24CO3
The origin of color of violet scapolite is related to radiation-induced color centers involving the CO3- ion that can be formed from radiation damage.
The gem quality varieties of the scapolite group of minerals pictured here are usually the mineral marialite.

Link to references about the spectra of scapolite group minerals


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