... Khibiny and Lovozero, Russia and two “gonnardite” samples from Tvedalen, Norway and Gignat, France. Observations are given to indicate that the Norwegian sample deduced to be tetranatrolite rather than gonnardite. Although the crystal structures of tetranatrolite and gonnardite are very similar...

...G. Artioli; E. Galli Abstract Gonnardite is a fibrous zeolite. Its chemical variability and the frequent close association with thomsonite and other zeolites have made the chemical and crystal structural definition of the mineral difficult. Only recently was the structural relationship to natrolite...

...Kazuo Harada; Shigeki Iwamoto; Kuniaki Kihara Abstract Erionite, phillipsite and gonnardite have been found in the amygdales of altered basalt, Mazé, Niigata Prefecture, Japan. Chemical, physical, optical and X-ray data are provided. Erionite is hexagonal, Pti-s/mmc . Copyright © 1967...

... on gonnardite. Hansesmarkite is biaxial (+) with refractive indices (white light): α = 1.683(2), β = 1.698(2) and γ = 1.745(3); 2V (meas.) = 60.7(6)° and 2V (calc.) = 60.3°. The mineral exhibits moderate dispersion ( r > v ) and is pleochroic with X (almost colourless) < Y (pale yellow) << Z...

..., with a white streak and vitreous luster. Crystal aggregates are botryoidal masses up to 1.5 mm in size. The mineral is brittle with a good {011} parting. Associated minerals include aegirine, natrolite, gmelinite, and gonnardite. Garronite-Na is monoclinic, space group I 2, with unit-cell parameters refined...

...Malcolm Ross; Marta J. K. Flohr; Daphne R. Ross Abstract The zeolite minerals of the natrolite group (natrolite, tetranatrolite, paranatrolite, mesolite, scolecite, thomsonite, gonnardite, edingtonite, and tetraedingtonite) have the general formula (Na,Ca,Ba) 8–16 (Al,Si) 40 O 80 · n H 2 O...

...Philip S. Neuhoff; Scott Kroeker; Lin-Shu Du; Thráinn Fridriksson; Jonathan F. Stebbins Abstract Disordering of Si and Al in natrolite, scolecite, mesolite, and gonnardite was investigated with 29 Si and 27 Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The results...

... (analcime, chabazite-Ca, chabazite-Na, garronite, gismondine, gmelinite-Ca, gmelinite-Na, gobbinsite, gonnardite-Na, natrolite, mesolite, phillipsite-Ca, phillipsite-K, phillipsite-Na and scolecite) and other secondary minerals (calcite, smectite-group minerals, goethite and Mn-oxides). Chabazite-Na...

...D. S. Coombs; C. A. Bosel; Y. Kawachi; L. A. Paterson Abstract A gonnardite-thomsonite-chabazite-calcite assemblage forms a cement in the Foveaux Formation, a fossiliferous gabbroic boulder bed that accumulated at the base of a sea cliff cut in a Permian igneous complex during late Oligocene–early...

... emplaced into a sedimentary sequence and are characterized by high zeolite contents (Endhalden: 48 wt%, Fohberg: 45 wt%) with the temporal sequence: ± thomsonite-Ca ± mesolite – gonnardite – natrolite – analcime. In the western Kaiserstuhl zeolite contents are lower (Kirchberg: 26 wt% or less...

.... 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...

... orange in color, with a white streak and vitreous luster. Bladed crystals are prismatic, having forms {111̅} and {101̅}; they are elongate on [101], up to 10 mm in length. Associated minerals include aegirine, albite, analcime, ancylite-(Ce), calcite, catapleiite, gonnardite, hydrotalcite, kupletskite...

..., 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...

... with tundrite-(Ce) are aegirine, analcime, an astrophyllite-group mineral, catapleiite, a eudialyte-group mineral, gonnardite, mangan-neptunite, monazite-(Ce), natrolite, rhodochrosite, sphalerite and vinogradovite. Tundrite-(Ce) is triclinic, space group P 1̅, with the following unit-cell parameters, refined...