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- W2104234080 abstract "Abstract Parasibirskite, with the ideal formula Ca 2 B 2 O 5 ·H 2 O, is a new mineral species found at Fuka, Okayama Prefecture, Japan. It is a polymorph of sibirskite, CaHBO 3 , and occurs as subparallel aggregates of tabular crystals up to 40 × 20 × 3 µm in size. Associated minerals are takedaite, olshanskyite, sibirskite, frolovite and calcite. The mineral is white, and has a weak pearly luster. Optically, the mineral is biaxial positive, α 1.556(2), β 1.593(2), γ 1.663(2) (λ 589 nm). The Vickers microhardness of aggregates is 121 kg mm −2 . The mineral is monoclinic with space group of P 2 1 / m , a 6.722(4), b 5.437(2), c 3.555(2) Å, β 93.00(5)°, V 129.8(2), Å 3 . The strongest lines in the X-ray powder pattern [ d in Å ( I )( hkl )] are 2.237(100)(300), 6.73(70)(100), 2.975(60)(011), 3.354(30)(200), 2.855(20)(210) and 1.776(20) (002). Wet chemical analysis, electron-microprobe analysis and ICP emission spectrometry give the values CaO 56.06 %, B 2 O 3 34.10 %, H 2 O 9.97 % and total 100.13%. The empirical formula calculated on the basis of O = 6 is Ca 1.985 B 1.945 O 4.901 ·1.099H 2 O, for Z = 1, D calc 2.54 and D meas 2.50(1) g cm −3 . Parasibirskite is formed by hydrothermal alteration of takedaite." @default.
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- W2104234080 date "1998-08-01" @default.
- W2104234080 modified "2023-09-23" @default.
- W2104234080 title "Parasibirskite, a new mineral from Fuka, Okayama Prefecture, Japan" @default.
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- W2104234080 doi "https://doi.org/10.1180/002646198547891" @default.
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