@techreport{oai:soar-ir.repo.nii.ac.jp:00016926,
 author = {矢彦沢,  清充 and 加藤,  和彦 and 荒井,  智彦 and 上野,  満夫 and 山本,  満寿夫 and 藤松,  仁},
 month = {Mar},
 note = {The microscopic pyrite is most frequently found in the gray mudstone，gray sandstone and black shales which occur at Bessho-，Aoki-，a nd Uchimura formation in the north -eastern Matsumoto region. Forms and shapes of the pyrites have been investigated by electron microscopic measurements_ The pyrites were made up of spherical aggregates of microcrystals termed framboid and single euhedral crystal containing mainly octahedron and truncated octahedron. The framboidal pyrites were composed of various shapes of single crystals. The crystal habits of microcrystals forming the framboids were octahedron and truncated octahedron. The framboids have various diameters ranging from 1 to 60um. The diameters of the microcrystals contained in the framboids were in various sizes fromO.5 to 5um，a nd it seems that the diameter of microcrystals increases with the diameter of framboids. Pyrite -sulfur of the unweatherd mudstone， sandstone and shale is contained in the range of 0.01 -1% . Framboids in the weatherd mudstone，sandstone and shales are composed of the limonite. The occurrence of microscopic pyrite suggests sign of strong reduction of resediment at the early stage of diagenesis of mudstone，sandstone and .shale in the north - eastern Matsumoto region., Article, 環境科学年報13:114-122(1991)},
 title = {松本北東地域の新第三紀海成堆積物中に見出される微小パイライトについて},
 year = {1991}
}