31. It was approved as a mineral by the International Mineralogical Association in 1980. 32. Doctor of Geological and Mineralogical Sciences ( 1973 ). 33. Cryptomelane was approved in 1982 by the International Mineralogical Association ( IMA ). 34. In 1880, H�berlein wrote to the Mineralogical Museum of the Berlin University. 35. He wrote on organic, physiological and mineralogical chemistry. 36. Hahn-Weinheimer then worked at the Mineralogical Institute of the Frankfurt University. 37. Sal ammoniac is a name of the natural, mineralogical form of ammonium chloride. 38. Important mineralogical resources which help the economy include copper, silver, and cobalt. 39. DTA may be used in cement chemistry, mineralogical research and in environmental studies. 40. Modern petrology identifies rocks according to mineralogical criteria.
