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Plumbogaidonnayite, PbZrSi3O9⋅2H2O, a new Pb-member of the gaidonnayite group from the Saima alkaline complex, Liaoning Province, China

群(周期表) 中国 化学 矿物学 地理 考古 有机化学
作者
Bin Wu,Xiangping Gu,Xin Gui,Christophe Bonnetti,Can Rao,Rucheng Wang,Jianjun Wan,Wenlei Song
出处
期刊:Mineralogical Magazine [Cambridge University Press]
卷期号:88 (2): 185-194 被引量:3
标识
DOI:10.1180/mgm.2024.2
摘要

Abstract Plumbogaidonnayite, ideally PbZrSi 3 O 9 ⋅2H 2 O, is a new gaidonnayite-group mineral discovered as a secondary product derived from the alteration of eudialyte from the Saima alkaline complex, China. It occurs as aggregates (up to 1 mm) composed of subhedral to anhedral or platy crystals (individually 5–50 μm), associated closely with microcline, natrolite, aegirine, gaidonnayite, georgechaoite, zircon, bobtraillite and britholite-(Ce) in eudialyte pseudomorphs. The crystals are transparent, colourless or light brown with a vitreous lustre. Plumbogaidonnayite is brittle with conchoidal fracture, and it has a Mohs hardness of ~5 and a calculated density of 3.264 g/cm 3 . It is optically biaxial (+) with α = 1.61(3), β = 1.63(3) and γ = 1.66(4). The calculated 2V is 80°, with the optical orientations X , Y and Z parallel to the crystallographic a , b and c axes, respectively. The empirical formula is (Pb 0.70 Ca 0.17 Ba 0.01 K 0.11 Na 0.01 Y 0.01 ) Σ1.01 (Zr 1.00 Hf 0.01 Ti 0.01 ) Σ1.02 Si 3.01 O 9 ⋅2H 2 O calculated on the basis of nine oxygen atoms per formula unit and assuming the occurrence of two H 2 O groups. Plumbogaidonnayite is orthorhombic, P 2 1 nb , a = 11.7690(4) Å, b = 12.9867(3) Å, c = 6.66165(16) Å, V = 1018.17(5) Å 3 and Z = 4. The nine strongest lines of its powder XRD pattern [ d in Å ( I , %) ( hkl )] are: 6.489 (36) (020), 5.803 (100) (101), 4.661 (27) (021), 4.336 (29) (121), 3.640 (30) (221), 3.114 (79) (112), 2.947 (27) (400), 2.622 (27) (241) and 2.493 (27) (312). Plumbogaidonnayite has a similar spiral chain framework structure with gaidonnayite and georgechaoite, which is composed of SiO 4 tetrahedra and ZrO 6 octahedra, but with disordered extra-framework sites (cations and H 2 O groups) characterised by the substitution of 2Na + (K + )→Pb 2+ (Ca 2+ ) + □ (vacancy). The discovery of plumbogaidonnayite adds a new perspective on the cation ordering and heterovalent substitution mechanism in gaidonnayite-group minerals.
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