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Vol.XVIII, Nos.1-2 >

Acmite-Vanadium Acmite Solid Solution in the Presence of H2O at High Pressures

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Title: Acmite-Vanadium Acmite Solid Solution in the Presence of H2O at High Pressures
Authors: Hariya, Yu Browse this author
Yoshikawa, Kazuo Browse this author
Issue Date: Feb-1978
Publisher: 北海道大学
Journal Title: 北海道大学理学部紀要
Journal Title(alt): Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
Volume: 18
Issue: 1-2
Start Page: 49
End Page: 55
Abstract: Vanadium acmite (NaV3+Si2O6) was synthesized in presence of H2O at high pressure. The refractive indices of synthetic vanadium acmite are a=1.736 (3), γ=1.785 (5) and the cell parameters are a=9.640 (1) Å, b=8.748 (2) Å, c=5.297 (1) Å, β=106.89 (1)° and V=427.4 (1) Å3 . This pyroxene is stable at least up to 30 kb at 800℃ with H2O under reducing environment, and it melts incongruently to occur opaque crystal and liquid. Acmite75 -vanadium acmite25, acmite50-vanadium acmite50 and acmite25-vanadium acmite75 compositions also crystallizes easily at 500 bars and 600℃ with H2O. The cell parameters of synthetic acmite-vanadium acmite series change linearlly with molar compositions. This systematic changes in cell parameters suggest that a continuous solid solution series exists between NaFe3+Si2O6 and NaV3+Si2O6, Melting of pyroxene of composition acmite50 -vanadium acmite50 is relatively insensitive to PH2O in the studied pressure range of 5 - 30 kb.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/34823
Appears in Collections:Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XVIII, Nos.1-2

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