Research output: Contribution to journal › Article › peer-review
Chiyokoite, Ca3Si(CO3)[B(OH)4]O(OH)5'12H2O, a new ettringite-group mineral from the fuka mine, Okayama prefecture, Japan. / Lykova, Inna; Chukanov, Nikita V.; Pekov, Igor V.; Yapaskurt, Vasiliy O.; Pautov, Leonid A.; Karpenko, Vladimir Y.U.; Belakovskiy, Dmitry I.; Varlamov, Dmitry A.; Britvin, Sergey N.; Scheidl, Katharina S.
In: Canadian Mineralogist, Vol. 58, No. 5, 09.2020, p. 653-662.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Chiyokoite, Ca3Si(CO3)[B(OH)4]O(OH)5'12H2O, a new ettringite-group mineral from the fuka mine, Okayama prefecture, Japan
AU - Lykova, Inna
AU - Chukanov, Nikita V.
AU - Pekov, Igor V.
AU - Yapaskurt, Vasiliy O.
AU - Pautov, Leonid A.
AU - Karpenko, Vladimir Y.U.
AU - Belakovskiy, Dmitry I.
AU - Varlamov, Dmitry A.
AU - Britvin, Sergey N.
AU - Scheidl, Katharina S.
N1 - Funding Information: We thank Herta Effenberger and an anonymous referee for their valuable comments. A part of this work (IR spectroscopic study and preliminary semi-quantitative EDS measurements) was carried out in accordance with the state task, state registration No. AAAA-A19-119092390076-7. Support by the SPbSU X-Ray Diffraction Resource Centre is acknowledged. Publisher Copyright: © 2020 Mineralogical Association of Canada. All rights reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/9
Y1 - 2020/9
N2 - The new ettringite-group mineral chiyokoite, ideally Ca3Si(CO3)[B(OH)4]O(OH)5'12H2O, was found in a hydrothermally altered calc-silicate skarn at the Fuka mine, Okayama Prefecture, Japan. Associated minerals are calcite, henmilite, and tacharanite. Chiyokoite occurs as hexagonal prismatic crystals up to 30 lm long and up to 20 lm thick. The major forms are the hexagonal prism {10-10} and monohedra {0001} and {000-1}. The crystals are combined in clusters which form friable nests up to 1 cm across. The mineral is pink to colorless with white streak and vitreous luster. The cleavage is parallel to {10-10} and {0001}, good. The fracture is stepped. Dmeas is 1.85(1) g/cm3, Dcalc is 1.85 g/cm3. Chiyokoite is optically uniaxial (-), x ¼ 1.523(2) and e ¼ 1.492(3) (589 nm). The infrared spectrum is reported. The chemical composition (wt.%) is CaO 27.56, B2O3 3.47, Al2O3 3.05, Fe2O3 0.12, As2O3 4.77, MnO2 0.32, SiO2 6.55, SO3 0.76, H2O 46.3, CO2 7.30, total 100.2. The empirical formula calculated on the basis of 3 Ca apfu is H31.37Ca3(Si0.67Al0.37Mn4þ0.02Fe3þ0.01)R1.07(C1.01B0.61As3þ0.29S0.06)R1.97O24.19. The simplified general formula is Ca3(Si,Al)(CO3,AsO3)[B(OH)4,AsO3](OH)6'12H2O. Chiyokoite is hexagonal, P63, a ¼ 11.0119(5), c ¼ 10.5252(6) Å, and V ¼ 1105.3(1) Å3. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 9.53(100)(100), 5.50(24)(110), 4.618(11)(102), 3.812(23)(112), 3.412(15)(211), 2.726(14)(302), 2.521(19)(123), and 2.172(13)(320,402,223). The crystal structure, refined from single-crystal X-ray diffraction data [R1(F) ¼ 0.042], is based on [Ca3(Si,Al)(OH)6(H2O)12] columns parallel to the c axis with B(OH)4- and CO32- and admixed AsO33-anionic groups in channels between the columns. The mineral is named in honor of Professor Chiyoko Henmi (1949-2018).
AB - The new ettringite-group mineral chiyokoite, ideally Ca3Si(CO3)[B(OH)4]O(OH)5'12H2O, was found in a hydrothermally altered calc-silicate skarn at the Fuka mine, Okayama Prefecture, Japan. Associated minerals are calcite, henmilite, and tacharanite. Chiyokoite occurs as hexagonal prismatic crystals up to 30 lm long and up to 20 lm thick. The major forms are the hexagonal prism {10-10} and monohedra {0001} and {000-1}. The crystals are combined in clusters which form friable nests up to 1 cm across. The mineral is pink to colorless with white streak and vitreous luster. The cleavage is parallel to {10-10} and {0001}, good. The fracture is stepped. Dmeas is 1.85(1) g/cm3, Dcalc is 1.85 g/cm3. Chiyokoite is optically uniaxial (-), x ¼ 1.523(2) and e ¼ 1.492(3) (589 nm). The infrared spectrum is reported. The chemical composition (wt.%) is CaO 27.56, B2O3 3.47, Al2O3 3.05, Fe2O3 0.12, As2O3 4.77, MnO2 0.32, SiO2 6.55, SO3 0.76, H2O 46.3, CO2 7.30, total 100.2. The empirical formula calculated on the basis of 3 Ca apfu is H31.37Ca3(Si0.67Al0.37Mn4þ0.02Fe3þ0.01)R1.07(C1.01B0.61As3þ0.29S0.06)R1.97O24.19. The simplified general formula is Ca3(Si,Al)(CO3,AsO3)[B(OH)4,AsO3](OH)6'12H2O. Chiyokoite is hexagonal, P63, a ¼ 11.0119(5), c ¼ 10.5252(6) Å, and V ¼ 1105.3(1) Å3. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 9.53(100)(100), 5.50(24)(110), 4.618(11)(102), 3.812(23)(112), 3.412(15)(211), 2.726(14)(302), 2.521(19)(123), and 2.172(13)(320,402,223). The crystal structure, refined from single-crystal X-ray diffraction data [R1(F) ¼ 0.042], is based on [Ca3(Si,Al)(OH)6(H2O)12] columns parallel to the c axis with B(OH)4- and CO32- and admixed AsO33-anionic groups in channels between the columns. The mineral is named in honor of Professor Chiyoko Henmi (1949-2018).
KW - Chiyokoite
KW - Crystal structure
KW - Ettringite group
KW - Fuka mine
KW - Japan
KW - New mineral
UR - http://www.scopus.com/inward/record.url?scp=85098666296&partnerID=8YFLogxK
U2 - 10.3749/canmin.2000030
DO - 10.3749/canmin.2000030
M3 - Article
AN - SCOPUS:85098666296
VL - 58
SP - 653
EP - 662
JO - Canadian Mineralogist
JF - Canadian Mineralogist
SN - 0008-4476
IS - 5
ER -
ID: 72812111