Nitrate of Barium occurs in Octahedral crystals, soluble in water.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson
If this ring be also heated, Octahedral crystals of arsenic will be deposited farther up the tube, and are easily recognized by the microscope.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson