Kinoite from Fuka, Okayama Prefecture, Japan

Isao Kusachi, Makoto Nishimura, Kanako Shiraga, Shoichi Kobayashi, Junji Yamakawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Kinoite was found in a dump at the Fuka mine, Okayama Prefecture, Japan. It occurs as aggregates of flaky crystals, and rarely as subhedral platy crystals up to 1 mm wide in a vein cutting into crystalline limestone. Associated minerals are stringhamite, calcite and an unidentified mineral. The empirical formula of the mineral is (Ca2.00Mga0.02)∑2.02(Cu 1.92Fe0.04Co0.04)∑2.00Si 2.98O10 · 2.25H2O on the basis of O=10 (anhydrous). The unit cell parameters are a=6.989 (1), b=12.904 (2), c=5.659 (1) Å, and β=96.15 (2)°. The mineral is optically biaxial negative with refractive indices α= 1.642 (2), β= 1.662 (2), and γ= 1.675 (2). The Vickers microhardness is 536 kg mm-2 (50 g load) and the density is 3.14 g cm-3. It is likely that kinoite at the Fuka mine was formed as a primary mineral by a reaction of Cu- and Si-bearing fluids with limestone.

Original languageEnglish
Pages (from-to)29-33
Number of pages5
JournalJournal of Mineralogical and Petrological Sciences
Volume96
Issue number1
DOIs
Publication statusPublished - Jan 1 2001

ASJC Scopus subject areas

  • Geophysics
  • Geology

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