... 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...

...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...

...F ig . 4. Hemispherical aggregates of gonnardite-Na with natrolite; the field of view is 8 cm across. ...

...F ig . 2. Photomicrograph, crossed polars, showing cross sections of gonnardite prisms (almost square, black), surrounded by epitaxial growths of thomsonite laths (birefringent, white) near the edge of a void (upper left). The original cavity wall is near the base. (OU 36883, Foveaux Formation). ...

..., fluorapatite, baryte, barytocalcite, cancrinite, galena, goethite, gonnardite, harmotome, edingtonite, a potentially new Mg-bearing edingtonite-like mineral, natrolite, nordstrandite, pyrite, quintinite and sphalerite. Alteration of the primary silicate–carbonate assemblage has resulted in a secondary...

... 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...

... of 27 mineral species in five separate parageneses have been identified from the pegmatite to date. Many of these minerals are being described from the Ice River Alkaline Complex for the first time, including anatase, brookite, gibbsite, gonnardite, henrymeyerite, lucasite-(Ce), nordstrandite...

... 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...