Chiyokoite, Ca3Si(CO3)[B(OH)4]O(OH)5·12H2O, a new ettringite-group mineral from the Fuka mine, Okayama Prefecture, Japan

IF 1.1 4区地球科学 Q3 MINERALOGY

Canadian Mineralogist Pub Date : 2020-11-24 DOI:10.3749/canmin.2000030

I. Lykova, N. Chukanov, I. Pekov, V. Yapaskurt, L. Pautov, V. Y. Karpenko, D. I. Belakovskiy, D. Varlamov, S. Britvin, K. Scheidl

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Abstract

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 μm long and up to 20 μm thick. The major forms are the hexagonal prism {100} and monohedra {0001} and {000}. 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 {100} and {0001}, good. The fracture is stepped. Dmeas is 1.85(1) g/cm3, Dcalc is 1.85 g/cm3. Chiyokoite is optically uniaxial (–), ω = 1.523(2) and ε = 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(Si0.67Al0.37Mn4+0.02Fe3+0.01)Σ1.07(C1.01B0.61As3+0.29S0.06)Σ1.97O24.19. The simplified general formula is Ca3(Si,Al)(CO3,AsO3)[B(OH)4,AsO3](OH)6·12H2O. Chiyokoite is hexagonal, P63, a = 11.0119(5), c = 10.5252(6) Å, and V = 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) = 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).

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日本冈山县富加矿新钙矾石族矿物Chiyokoite，Ca3Si（CO3）[B（OH）4]O（OH）5·12H2O

在日本冈山县富加矿的一个水热蚀变钙硅酸盐矽卡岩中发现了新的钙矾石族矿物千代矿，理想情况下为Ca3Si（CO3）[B（OH）4]O（OH）5.12 H2O。伴生矿物有方解石、铁白云石和蓝晶石。赤铁矿以六方棱柱晶体的形式出现，长可达30μm，厚可达20μm。主要的形式是六棱柱{100}和单面体{0001}和{000}。晶体成簇组合在一起，形成直径达1厘米的易碎巢穴。矿物呈粉红色至无色，有白色条纹和玻璃光泽。解理平行于{100}和{0001}，良好。骨折呈阶梯状。Dmeas为1.85（1）g/cm3，Dcalc为1.85 g/cm3。Chiyokoite为光学单轴（–），ω=1.523（2），ε=1.492（3）（589 nm）。报道了红外光谱。化学成分（wt.%）为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，总计100.2。根据3 Ca apfu计算的经验公式为H31.37Ca3（Si0.67Al0.37Mn4+0.02Fe3+0.01）∑1.07（C1.01B0.61As3+0.29S0.06）∑1.97O24.19。简化的通式为Ca3（Si，Al）（CO3，AsO3）[B（OH）4，AsO3]（OH）6·12H2O。Chiyokoite是六方晶系，P63，a=11.0119（5），c=10.5252（6）Å，V=1105.3（1）Å3。粉末X射线衍射图[d，Å（I）（hkl）]的最强反射为：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）和2.172（13）（320402223）。根据单晶X射线衍射数据细化的晶体结构[R1（F）=0.042]，基于平行于c轴的[Ca3（Si，Al）（OH）6（H2O）12]柱，具有B（OH）4-和CO32-以及柱之间通道中混合的AsO33-阴离子基团。该矿物以千代千弥教授（1949–2018）的名字命名。

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来源期刊

Canadian Mineralogist 地学-矿物学

CiteScore

2.20

自引率

22.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Since 1962, The Canadian Mineralogist has published papers dealing with all aspects of mineralogy, crystallography, petrology, economic geology, geochemistry, and applied mineralogy.