...Bin Wu; Xiangping Gu; Xin Gui; Christophe Bonnetti; Can Rao; Rucheng Wang; Jianjun Wan; Wenlei Song 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...

.... It is associated with microcline, albite, natrolite, gonnardite, aegirine, siderite, elpidite, gaidonnayite, zircon, franconite, dawsonite, rhodochrosite, cryolite, rutile, and sphalerite. Lecoqite-(Y) forms radiating, spray-like aggregates in compact, tightly packed masses to 2.5 cm across, composed of flexible...

..., was found in the Poudrette pegmatite, Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. It is associated with albite, aegirine, natrolite, gonnardite, siderite, petersenite-(Ce), franconite, dawsonite, analcime, quartz, eudidymite, catapleiite, gaidonnayite, monazite-(Ce), calcite, adamsite-(Y...

... to fibrous crystals. These crystals are up to 2.5 cm in length and form spherical radiating aggregates. Associated minerals include aegirine, albite, analcime, ancylite-(Ce), calcite, catapleiite, dawsonite, donnayite-(Y), elpidite, epididymite, eudialyte, eudidymite, fluorite, franconite, gaidonnayite...

.... Individual crystals are ∼2 μm in thickness, dominated by the pinacoid {100}, and colorless to pale yellow in color. Associated minerals include albite, calcite, aegirine, quartz, gaidonnayite, a sodic clinoamphibole, an apophyllite-group mineral, and pyrrhotite (?). Melansonite has a vitreous luster...

..., hydroxylapatite, belovite-(La), belovite-(Ce), gaidonnayite, nenadkevichite, epididymite, apophyllite-(KF), and sphalerite. Saamite has perfect cleavage on {001}, uneven fracture and a Mohs hardness ca. 3. Its calculated density is 3.243 g/cm 3 . Saamite is biaxial positive with α 1.760, β 1.770, γ 1.795 (λ 589...

..., belovite-(La), belovite-(Ce), gaidonnayite, nenadkevichite, epididymite, apophyllite-(KF), and sphalerite. Kolskyite has perfect cleavage on {001}, splintery fracture, and a Mohs hardness of 3. Its calculated density is 2.509 g/cm 3 . Kolskyite is biaxial negative with α 1.669, β 1.701, γ 1.720 (λ 590 nm...

...), gaidonnayite, nenadkevichite, epididymite, apophyllite-(KF) and sphalerite. Kazanskyite has perfect cleavage on {001}, splintery fracture and a Mohs hardness of 3. Its calculated density is 2.930 g cm −3 . Kazanskyite is biaxial positive with α 1.695, β 1.703, γ 1.733 (λ 590 nm), 2V meas = 64.8(7)°, 2V calc...

... peninsula, Russia. Associated minerals are natrolite, microcline, aegirine, pectolite, lamprophyllite, belovite-(Ce), belovite-(La), gaidonnayite, nenadkevichite, komarovite, manganokukisvumite, epididymite, sphalerite, neotocite, etc . Stronadelphite forms hexagonal, prismatic to acicular crystals up...

... Kukisvumchorr. It forms rosettes scattered in a natrolite matrix which are up to 1–5 cm in diameter and composed of extremely fine (0.01–0.1 mm) bounded flakes and lamellae. Nechelyustovite is associated with natrolite, belovite-(La), belovite-(Ce), gaidonnayite, nenadkevichite, epididymite, fluorapophyllite...

... the sodium and calcium zirconosilicates, respectively. These two pseudoternary systems contain quarlz, H 2 O, and either elpidite, vlasovite, catapleiite, gaidonnayite, hilairite, and parakeldyshite, in the first case, or gittinsite, armstrongite, calcium catapleiite, and calciohilairite, in the latter case...

...-like hydrous Na-rich and/or K-rich zircono-, titano- and niobosilicates such as catapleiite, the gaidonnayite–georgechaoite series, tumchaite, and minerals of the labuntsovite supergroup ( F ig . 1 ) ( Chukanov et al. 2003 ). Further examples are given in other reviews, such as de Barros Gomes et al...

... in T , P or activity of the fluid may also play critical roles in determining which of these phases crystallizes. Lastly, it is interesting to compare the silicate topologies of the six Na zirconosilicate hydrates ( Table 6 ). Elpidite, gaidonnayite, hilairite and catapleiite are all unbranched chain...

... of synthetic counterparts of the minerals gaidonnayite, petarasite and umbite. Many microporous heteropolyhedral compounds containing metals such as Nb, V, Sn, Ca and lanthanides, have been reported and a wide number of distinct structural types (e.g., rhodesite-delhayelite and tobermorite) have been...