Note on rock-forming minerals in the Joetsu district, Niigata Prefecture, Japan. (12) : Magnesio-arfvedsonite from the Omi district
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概要
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Magnesio-arfvedsonite forms interstitial crystal, and aggregate of subhedral and euhedral green crystals in the melanoclatic part of albitite rock in serpentinite, Kinzan valley, Omi, Niigata Prefecture, Japan. It coexisted with albite, pectolite and strontio-orthojoaquinite. Magnesio-riebeckite occurs as green, needle-shaped crystals of aggregate in garnet chlorite schist xenolith in serpentinite. Garnet is partially replaced by riebeckite and magnesio-riebeckite. magnesio-riebeckite coexists with muscovite, chlorite, plagioclase, K-feldspar and quartz. Pleochroism of magnesio-arfvedsonite is strong : X=greenish blue and Z=violet or greenish yellow. Magnesio-arfvedsonite has the formula (K_<0.33>Na_<0.64>)_<0.97> (Na_<1.89>Ca_<0.11>Fe^<2+>_<1.22>Mg_<3.06>Fe^<3+>_<0.48>Cr_<0.02>Ti_<0.21>Al_<0.02>_7(Al_<0.01>Si_<7.99>)_8O_<22> (OH)_2. Unit-cell dimensions of magnesio-arfvedsonite are a=9.386(12)Å, b=18.034(15)Å, c=5.305( 6 )Å, β=103.08(12)゜ and v=916.6(1.6)Å^3.
著者
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Oba Takanobu
Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Univers
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Oba Takanobu
Department Of Geosciences
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