TY - RPRT TI - Pentaborate polyanion in the crystal structure of ulexite, NaCaB 5 O 6 (OH) 6 *5H 2 O AU - Joan R. Clark AU - Daniel E. Appleman PY - 1964 DO - 10.1126/science.145.3638.1295 UR - https://pubs.usgs.gov/publication/70010745 ID - 70010745 ER -