2026-03-06T02:05:30Z https://juen.repo.nii.ac.jp/oai

oai:juen.repo.nii.ac.jp:00004859 2024-03-11T04:58:52Z 993:994:998

Note on rock-forming minerals in the Joetsu district, Niigata Prefecture, Japan (9) Leucosphenite from the Omi district Oba, Takanobu Albitite Boron Leucosphenite Omi Leucosphenite occurs as small, pale blue, elongated tabular crystals in the cavities of riebekite bearing albitite on the floor of the Kinzan valley, Omi, Niigata Prefecture. The leucosphenite as boron mineral is found from some locations in the world. In the present study, the leucosphenite with very low boron content is reported. Leucosphenite coexists with albite, mica, Mg-riebekite, ohmilite, pectolite and quartz. The coexisting mineral is not boron mineral. The structural formula is K_<0.01>Na_<4.64>Ba_<1.19>Mn_<0.02>Fe_<0.01>Ti_<2.08>Al_<0.01>B_<0.34>Si_<11.00>O_<30>. The space group is C2/m, and unit cell paramenters are a =9.8232 (12) Å, b= 16.839 (18) Å, c=7. 203(11) Å, β=93゜ 24 (1)' and v=1189.3 (26) Å3. departmental bulletin paper 上越教育大学 1996-03 VoR application/pdf 上越教育大学研究紀要 2 15 537 544 0915-8162 https://juen.repo.nii.ac.jp/record/4859/files/kiyo15_2-26.pdf http://hdl.handle.net/10513/412 https://juen.repo.nii.ac.jp/records/4859 eng AN10284863