A potential gem mineral from the Mogok, Burma, area was identified in 1957. It was named after a famous gem collector and resident of Mogok, Mr. A.C.D. Pain. The stone was described as a transparent dark garnet red crystal that weight 1.7 grams. It has indices of 1.787 - 1.816 and is uninxial negative, crystallizing in the hexagonal system. The specific gravity is 4.01 and the hardness is approximately 8. The pleochroism varies from bright red parallel to the optic axis to pale brownish orange for vibration directions at right angles to the optic axis. The exact chemical composition has yet to be determined, but it is apparently a calcium aluminium borosilicnte. This is the only known specimen.
