Scapolites are metamorphic minerals with compositions suggestive of feldspars. There is a complete solid solution series between marialite and meionite. Sample description, NIR, MID-IR spectra and analysis published in: Swayze,G.A., and R.N. Clark, 1990, Infrared Spectra and Crystal Chemistry of Scapolites: Implications for Martian Mineralogy. J. Geophys Res. v. 95, pp. 14481-14495. IMAGE_OF_SAMPLE: NO PHOTO