@article{oai:niigata-u.repo.nii.ac.jp:00006899,
 author = {Sato, Koichi and Akai, Junji and Konishi, Hiromi},
 journal = {Science reports of Niigata University. Series E, (Geology and mineralogy), Science reports of Niigata University. Series E, (Geology and mineralogy)},
 month = {Mar},
 note = {Acid rain contains small solid particles, which may suggest the origin of the pollution of acid rain or polluted air. Fine mineral grains and solid particles in the acid rains which were collected at the Niigata district have been examined from the standpoint of mineralogy using TEM-AEM method. Large amounts of fine grained minerals or materials in acid rains were found and identified. They were classified as artificial and natural types , and into soluble and insoluble types in water. Examples of the most characteristic type are mullite and A1 Si spherules. Mullite and "sulphate" may suggest their pollution origin. Some another soluble sulphates , such as thenardite and aphthitalite, may also correspond to strong acidity and/or polluted rain.},
 pages = {1--20},
 title = {Environmental mineralogy on fine grained minerals and particles in acid rains at the Niigata district},
 volume = {10},
 year = {1995}
}