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Bimbowrieite, NaMgFe3+5(PO4)4 (OH)6⋅2H2O, a new dufrénite-group mineral from the White Rock No.2 quarry, South Australia, Australia
Mineralogical Magazine ( IF 2.7 ) Pub Date : 2023-11-13 , DOI: 10.1180/mgm.2023.86
Peter Elliott , Anthony R. Kampf

Bimbowrieite, NaMgFe3+5(PO4)4(OH)6⋅2H2O, is a new mineral found in a mineralogically zoned rare-element bearing pegmatite at the White Rock No.2 quarry, Bimbowrie Conservation Park, South Australia, Australia. Crystals are dark olive green to greenish brown and are bladed with dimensions of up to 150 μm. Crystals occur as aggregates up to 0.4 mm across associated with ushkovite, bermanite, leucophosphite and sellaite. Bimbowrieite is pleochroic, biaxial (+), with α = 1.785(5), β = 1.795(5), γ = 1.805(5) and 2V(meas.) = 89.4(5)°. The average of 28 chemical analyses gave the empirical formula: (Na0.81Ca0.19)Σ1.00(Mg0.75Mn2+0.19Fe2+0.05)Σ0.99(Fe3+4.99Al0.01)Σ5.00(PO4)3.97(OH)5.88⋅2.05 H2O based on 24 oxygen atoms. Bimbowrieite is monoclinic, space group C2/c with a = 25.944(5), b = 5.1426(10), c = 13.870(3 Å, β = 111.60(3)°, V = 1720.4(7) Å3 and Z = 4. The crystal structure was refined to R1 = 1.97% for 1060 observed reflections with F0 > 4σ(F0). Bimbowrieite is isostructural with dufrénite. The structure is based on a trimer of face-sharing octahedra in which an M2 octahedra shares two trans faces with two M4 octahedra. Trimers link in the c-direction by sharing corners with two M3 octahedra and with T1 and T2 tetrahedra. Linkage in the a-direction is via corner-sharing M1 octahedra and linkage in the b-direction is via corner-sharing T1 and T2 tetrahedra.



中文翻译:

Bimbowrieite,NaMgFe3+5(PO4)4 (OH)6⋅2H2O,一种来自澳大利亚南澳大利亚 White Rock No.2 采石场的新镁铝榴石族矿物

Bimbowrieite,NaMgFe 3+ 5 (PO 4 ) 4 (OH) 6 ⋅2H 2 O,是在南澳大利亚 Bimbowrie 保护公园 White Rock No.2 采石场的矿物学分区含稀有元素伟晶岩中发现的一种新矿物,澳大利亚。晶体呈深橄榄绿至绿棕色,刀片尺寸可达 150 μm。晶体以直径达 0.4 毫米的聚集体形式出现,与乌什科铁矿、铍铁矿、隐色亚磷酸盐和磷铜矿相关。辉沸石具有多色性、双轴 (+),α = 1.785(5)、β = 1.795(5)、γ = 1.805(5) 和 2V(meas.) = 89.4(5)°。28次化学分析的平均值得出经验公式: (Na 0.81 Ca 0.19 ) Σ1.00 (Mg 0.75 Mn 2+ 0.19 Fe 2+ 0.05 ) Σ0.99 (Fe 3+ 4.99 Al 0.01 ) Σ5.00 (PO 4 ) 3.97 (OH) 5.88 ⋅2.05 H 2 O 基于 24 个氧原子。辉沸石为单斜晶系,空间群C 2/c , a = 25.944(5)、b = 5.1426(10)、c = 13.870(3 Å、β = 111.60(3)°、V = 1720.4(7) Å 3Z = 4. 对于 1060 次观察到的反射, F 0 > 4σ( F 0 ),晶体结构被细化为R 1 = 1.97% 。Bimbowrieite 与 dufrénite 是同构的。该结构基于共面八面体的三聚体,其中M 2 八面体与两个M 4 八面体共享两个反式面。三聚体通过与两个M 3 八面体以及T 1 和T 2 四面体共享角在c方向上连接。a方向上的连接是通过共享角的M 1 八面体b方向上的连接是通过共享角的T 1 和T 2 四面体。

更新日期:2023-11-13
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