Description and crystal structure of Yvonite, Cu(AsO3OH)2H2O
Description and crystal structure of Yvonite, Cu(AsO3OH)2H2O
复制标题
Yvonite，Cu(AsO3OH)2H2O 的描述和晶体结构
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
R. Černý
中科院分区：
文献类型：
--
作者：
H. Sarp;R. Černý
摘要伊冯石，Cu（AsO_3 OH）_2H_2O，产于法国奥德省卡尔卡松附近的萨尔西尼矿。它形成聚集体或放射状小球，由单个绿松石蓝色晶体（最大尺寸为0.3 × 0.15 × 0.06 mm）组成。它们在c处伸长，在（010）处变平，在（100）处有一个完美的卵裂。矿物为三斜晶系，P1 α，a = 7.632（3），B = 11.168（3），c = 6.020（3）θ，α = 89.32（3），β = 86.55（5），γ = 74.43（3）°，V = 493.4（3）θ 3，Z = 4，Dmeas = 3.20（2）g/cm 3，Dcalc = 3.22（1）g/cm 3。莫氏硬度3.5-4。有光泽的玻璃状透明，条纹蓝色;光学双轴（-），在589 nm处α = 1.615（2），β = 1.660（2），γ = 1.700（2）; 2 Vobs = 82（2）°，2 Vcalc = 84（1）°。多色性弱，Z =蓝色，Y =浅蓝色，X =浅蓝色至无色。伴生矿物：孪晶矿、菱锰矿、毒砂、自然铋、黄铜矿、菱锌矿。通过直接方法（MoKα辐射）解析晶体结构，并使用1429个观察到的独特反射将其细化为R = 0.069，Rw = 0.043。结构中存在两个对称独立的畸变CuO_5（H_2 O）八面体。它们共享边缘并形成平行于[001]的顺式[CuO 3（H2O）]链。两个对称独立的扭曲AsO 3（OH）四面体交联这些链，形成平行于（100）片。两个对称独立的H2O分子位于片层之间，它们通过氢键网络连接，解释了伊冯石的完全裂解。该矿物在结构上与孪晶矿，Cu（AsO 3OH）（H2O）和钙锰矿，CaMn[（AsO 3OH）（H2O）]2有关。
Abstract Yvonite, Cu(AsO3OH)2H2O, was found in the Salsigne mine near Carcassone (Aude, France). It forms aggregates or radiating spherules consisting of individual crystals (maximal size 0.3 × 0.15 × 0.06 mm) of turquoise blue color. They are elongated in c, flattened on (010), and have a perfect cleavage on (100). The mineral is triclinic, P1̅, a = 7.632(3), b = 11.168(3), c = 6.020(3) Å , α = 89.32(3), β = 86.55(5), γ = 74.43(3)°, V = 493.4(3) Å3, Z = 4, Dmeas = 3.20(2) g/cm3, and Dcalc = 3.22(1) g/cm3. Mohs hardness 3.5-4. Luster vitreous transparent, streak blue; optically biaxial (-) with α = 1.615(2), β = 1.660(2), and γ = 1.700(2) at 589 nm; 2 Vobs = 82(2)°, 2 Vcalc = 84(1)°. Pleochroism weak with Z = blue, Y = light blue, and X = light blue to colorless. Associated minerals: geminite, lindackerite, arsenopyrite, native bismuth, chalcopyrite, and pushcharovskite. The crystal structure was solved by direct methods (MoKα radiation) and refined using 1429 observed unique reflections to R = 0.069, Rw = 0.043. There are two symmetrically independent distorted CuO5(H2O) octahedra in the structure. They share edges and form cis [CuO3(H2O)] chains parallel to [001]. Two symmetrically independent distorted AsO3(OH) tetrahedra cross-link these chains to form sheets parallel to (100). Two symmetrically independent H2O molecules are located between the sheets, which are linked by a network of hydrogen bonds, accounting for the perfect cleavage of yvonite. The mineral is structurally related to geminite, Cu(AsO3OH)(H2O), and fluckite, CaMn[(AsO3OH)(H2O)]2.