Note on rock-forming minerals in the Joetsu district, Niigata Prefecture, Japan (9) Leucosphenite from the Omi district

概要

論文の詳細を見る
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.
上越教育大学の論文