Note on rock-forming minerals in the Joetsu district, Niigata Prefecture, Japan. (10) Pectolite from the Omi district.

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概要

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• Pectolite, which is one of pyroxenoids, occurs as needle-like crystals in the albitite and serpentinite at the Kinzan valley, Omi, Niigata Prefecture. The pectolite is very pure in chemical composition. Pectolite coexists with albite, Mg-riebeckite, wollastonite and quartz. The coexisting pectolite and wollastonite suggest that it crystallized at about 400℃ during serpentinization. In the present study, the chemical composition and the physical properties of the pectolite are reported. The structural formula is Ca_<4.00>Mn_<0.01>Fe_<0.01>Na_<1.98>H_2Si_<6.00>O_<18>. The space group is P1^^-, and unit cell parameters are a = 7.994(2) Å, b= 7.039(5) Å, c = 7.020(2) Å, α=90.34(5)゜, β= 95.25(3)゜ γ=102.65(5)゜ and V = 383.7(3) Å^3.

• 上越教育大学の論文

著者

• Oba Takanobu

  Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Univers

• Yoshikawa Kazuo

  Department Of Earth Science Faculty Of Education Gunma University

• Oba Takanobu

  Department Of Geosciences Joetsu University Of Education

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