H in Pectolite

• Hammer VMF, Libowitzky E, Rossman GR (1998) Single-crystal IR spectroscopy of very strong hydrogen bonds in pectolite, NaCa₂[Si₂O₈(OH)], and serandite, NaMn₂[Si₃O₈(OH)].     
  American Mineralogist  83, 569-576.