Vimsite from the Fuka mine, Okayama Prefecture, Japan

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Marco E. Ciriotti
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Vimsite from the Fuka mine, Okayama Prefecture, Japan

Messaggio da Marco E. Ciriotti » mer 04 dic, 2019 20:27

▪ Kobayashi, S., Yuasa, M., Tanabe, M., Kishi, S., Kusachi, I. (2019): Vimsite from the Fuka mine, Okayama Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 114, 219-223.

Vimsite was found as a mass or a veinlet in crystalline limestone associated with gehlenite–spurrite skarns at the Fuka mine, Okayama Prefecture, Japan. Vimsite occurs as colorless to white aggregates of anhedral or prismatic transparent crystals up to 1 mm in length in association with shimazakiite, sibirskite, priceite, uralborite, calciborite, kurchatovite, and calcite. It is also formed as a 0.5 mm wide veinlet. An electron microprobe analysis of vimsite gave an empirical formula (Ca0.993Mg0.009Fe0.003Mn0.001)Σ1.006B1.996O2(OH)4 based on O = 6. The unit cell parameters are a = 10.021(3), b = 9.566(4), c = 4.447(2) Å, β = 91.231(9)°. The calculated density is 2.523 g cm−3. The Vickers microhardness is 186–206 kg mm−2 (25 g load). It is likely that vimsite from the Fuka mine was formed by subsequent hydrothermal alteration, as with uralborite and priceite, of sibirskite produced by the hydrothermal alteration of shimazakiite.
Marco E. Ciriotti

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