2026-03-15T01:36:12Z https://hiroshima.repo.nii.ac.jp/oai

oai:hiroshima.repo.nii.ac.jp:02015887 2025-06-02T04:22:55Z 1727147343679:1730442501655:1730442502315

Surface Microtopography of Pyrophyllite: Photograph Collection JIGE, Mayumi JIGE Mayumi KITAGAWA, Ryuji KITAGAWA Ryuji open access The surface microtopographies of pyrophyllite crystals from various localities has been investigated by using transmission electron microscopy (TEM) with the Au-decoration technique. The pyrophyllite specimens investigated were collected from the southern Urals (Russia), California (USA), the north part of Vietnam, the southwestern part of Korean Peninsula and southwest Japan. Gold-decoration successfully revealed growth steps (～1 nm in height) on the crystal surfaces. Pyrophyllite specimens from schistose and massive ores exhibit characteristically parallel growth patterns with narrow step separation, whereas polygonal spiral growth patterns with wider step separation are observed on crystal surfaces of pyrophyllite in veins. The morphology of pyrophyllite crystals seems to reflect the growth processes under different conditions (temperature and/or supersaturation), e.g., parallel steps on the irregular particles, on the other hand, polygonal spiral steps on polygonal plates. Hiroshima University 2003-08-25 eng departmental bulletin paper VoR https://doi.org/10.15027/53170 https://hiroshima.repo.nii.ac.jp/records/2015887 10.15027/53170 0075-4374 AA11095875 Journal of science of the Hiroshima University. Series C, Earth and planetary sciences Journal of science of the Hiroshima University. Series C, Earth and planetary sciences 11 2 247 247 255 https://hiroshima.repo.nii.ac.jp/record/2015887/files/JSHUCE_11-2_247.pdf 5.8 MB