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