Mont Semiol, Châtelneuf, Montbrison, Loire, Auvergne-Rhône-Alpes, France

Vug in olivine rich basaltic matrix lined with clay mineral and with sprays of long prismatic mazzite-Mg crystals and one small phillipsite crystal at lower left.

© Volker Betz (2022)

Cluster of rare not so extremely long prismatic, transparent mazzite -Mg crystals. This crystals have well visible even (0001) faces and are about 60 µm thick. A phillipsite crystal at left in background.

© Volker Betz (2020)

Nice spary of long prismatic Mazzite-Mg crystals on a very small basaltic matzrix. Some fractions of Phillipsite crystals are also present.

© Volker Betz (2021)

Field of view 3 mm. (ID uncertain, possible Offretite) Specimen and photo Leon Hupperichs.

© Leon Hupperichs

Size of image 1,5 mm

© Collection & photo Georges BRET

Mazzite-Mg, picture width about 6 mm. Excellent specimen from material collected about 1981. Vug opened 2004. Volker Betz Zeolite Collection

© Volker Betz (2006)

30x40 mm. Collected ca. 1982.

© Volker Betz (2008)

Clear short-prismatic crystals. Field of view ca. 2 mm. Zeolite Collection of Volker Betz.

© Volker Betz (2006)

Rare sample showing mazzite in paragesis with Offretite and Phillipsite. Collected ca. 1981. Field of View is ca. 2.5 mm. Zeolite Collection of Volker Betz.

© Volker Betz (2006)

Prismatic Offretite crystals. Field of view ca. 2 mm. Zeolite Collection of Volker Betz.

© Volker Betz (2005)

Crystal with 0,8cm - Overall size 4x4x2,5cm - December of 2004

© Photo & Collection of Martins da Pedra

Field of view ca. 9 mm. Very rich for the species. Collected 1981.

© Volker Betz (2009)

Chabazite, almost perfect rhomboedron ca. 1 mm. Zeolite Collection of Volker Betz.

© Volker Betz (2006)

Field of view ca. 8 mm of a 10x15 mm specimen. Extremely rich for the species. Collected in 1981.

© Volker Betz (2009)

Phillipsite multiple twin with (100) terminations. Field of view ca. 1.7 mm. Zeolite Collection of Volker Betz.

© Volker Betz (2006)

Field of view ca. 5 mm on a 15x5 mm specimen. Collected in 1981.

© Volker Betz (2009)

Whitish-yellow acicular erionite on matrix. Visual id from seller. Sony Alpha 7R ii/Mitutoyo Plan Apo X 20/Achromatic doublet retro/"Stone Master" Linear-actor & Control. Photo & Collection: Christophe Boutry.

© Christophe Boutry

Offretite crystals, montmorillonite(?) balls Photo & collection Vessely

© y vessely

mazzite-mg field of view 3mm photo & collection S.Broetto

offretite 3mm crystal photo & collection S.Broetto

Offretite. Vasco Trancoso collection and photo. FOV: 1,2 X 1cm. From exchange with Volker Betz.

Field of view ~10 mm. A crust of Offretite and Smectite over a dissolved sphere of Calcite. Zeolite collection of Volker Betz.

© Volker Betz (2009)

Offretite with some Philipsite. Vasco Trancoso collection and photo. FOV: 1,2 X 1cm. From exchange with Volker Betz (1981 find).

Mazzite. Vasco Trancoso collection and photo. FOV: 1,5 X 1,2cm. Both types of crystalization: With fine fibers and prismatic.From exchange with Volker Betz.

field of view 3mm

© Petr Fuchs

Field of view ~ 4 mm. Part of a small cavity showing Phllipsite coated by Opal; with a small group of Offretite and some Montmorillonite. From left to right. Collected in 1981. Zeolite collection of Volker Betz.

© Volker Betz (2008)

Field of view: 3 mm Photo and collection Antonio Borrelli

© Antonio Borrelli

Rare combination of mazzite-Mg and offretite, with sprays of acicular mazzite-Mg and radiating aggregates of thicker prismatic offretite. At this location offretite forms typical distorted crystals with stacking faults, while the mazzite-Mg crystals are perfect and mostly very thin.

© Volker Betz (2022)

Phillipsite crystal with 2mm on Offretite cape in vug - March of 2010

© Martins da Pedra photo & collection

4 mm long Perier-twin of Phillipsite terminated by (100) with a small cluster of Mazzite-Mg. Collected in 1981.

© Volker Betz (2011)

Nice sample of mazzite-Mg. Field of view 4 mm. Photo and specimen Leon Hupperichs.

© Leon Hupperichs

Chabazite Field of view 2,5 mm Photo and Collection Patrice Queneau

© Patrice.Queneau

Field of view 3.9 mm. A group of sprays of Mazzite-Mg crystals with Phillipsite. Collected in 1981.

© Volker Betz (2011)

Offretite Field of view 4 mm Photo and Collection Patrice Queneau

© Patrice.Queneau

Micro Offretite crystals on matrix with 4x3x3cm - Label from Volker Betz - March of 2013

© Photo & Collection of Martins da Pedra

Field with 15x10mm - December of 2012

© Photo & Collection of Martins da Pedra

Colorless, hexagonal crystals of Mazzite-Mg, 3mm field of view. Former Jaroslav Hyrsl collection. Rolf Luetcke specimen and photo.

Field of view 1.6x 2.2 mm. Exceptional large and transparent, longprismatic crystals of offretite from type location. Collected in 1981.

© Volker Betz (2013)

Offretite crystals in vug - 3,5x3x2,5cm - December of 2012

© Photo & Collection of Martins da Pedra

Field of view 3.9 mm. Exceptional rich specimen with very thin, almost 2 mm long crystals. Collected 1981. Zeolite collection of Volker Betz.

© Volker Betz (2011)

Exceptional "large" offretite crystal of 1.0 mm. This shows well that the offretite crystals are mostly disordered. Collected in 1980. Zeolite collection of Volker Betz. Stack made from 32 pictures with 20 µm distance. 15 mm Zeiss Jena Mikrotar (NA 0.2) on Leitz Ortholux I with Lumix D2 as camera direct attached without relay lens. Halogen ...

© Volker Betz (2011)

Field with 2x1,5cm - March of 2010

© Martins da Pedra photo & collection

Field of view 1.7 mm. Radiating aggregate of Offretite, 1.3 mm in diameter. Collected in 1981. Zeolite collection of Volker Betz.

© Volker Betz (2011)

Field of view 2.9 x3.9 mm. One of several Mazzite-Ca clusters on a 25x11 mm specimen. Collected in 1981. Zeolite collection of Volker Betz.

© Volker Betz (2011)

Prismatic crystals of offretite with hollow sphere of montmorillonite. Collected 1981.

© Volker Betz (2014)

Field of view 1.7 mm. Colorless, translucent crystals of offretite in the short prismatic form on a clay minerals layer.

© Volker Betz (2012)

Radiating groups of bundles of prismatic offretite crystals. The same vug shows also phillipsite crystals. Collected 1981.

© Volker Betz (2015)

Acicular crystals of mazzite-Mg with phillipsite. Collected 1981. Rich sample for species and location.

© Volker Betz (2015)

Field of view 0.8 mm. Zeolite collection of Volker Betz.

© Volker Betz (2012)

Colourless short hexagonal offretite crystals. Self-Collected July 1983. Olympus OM DE M5 Mark II.StackUnit. Mitutoyo Plan Apo X 10 /Raynox Dcr 150 Retro/ Aperture. Photo & Collection: Christophe Boutry.

© Christophe Boutry

Opale on offretite crystals Photo & collection Vessely

© y vessely

Hexagonal, shiny, transparent crystals, of offretite. Collection and photo by Gianfranco Ciccolini. Nikon D750, bellows, Luminar 25 mm.

Offretite crystals Field is 2,05mm large Zeiss Luminar 25mm on bellows + Nikon D5100. Combine Z Photo & collection Chollet Pascal (# 6054)

© Chollet Pascal

Clear chabazite crystal on montmoriollonite (?) balls Photo & collection Vessely

© y vessely

Mazzite-Mg sprays Photo & collection Vessely

© y vessely

Several sprays of Mazzite-Mg with clay minerals on a small rock matrix.

© Volker Betz (2020)

Olivine rich basaltic matrix with vugs with two versions of mazzite-Mg. At center a vug with long prismatic crystals and at right a vug with acicular slightly yellow, iron stained crystals. Minor phillipsite is also present.

© Volker Betz (2022)

Offretite crystal showing the typical slightly concave (0001) termination with some interrerence colours.

© Volker Betz (2020)

Colourless short hexagonal offretite crystals. Self-Collected July 1983. Olympus OM DE M5 Mark II.StackUnit.Mitutoyo Plan Apo X 5 /Raynox Dcr 150 Retro/ Aperture. Photo & Collection: Christophe Boutry.

© Christophe Boutry

Clear chabazite crystal on montmoriollonite (?) balls Photo & collection Vessely

© y vessely

Offretite crystals Field is 1,35mm large Zeiss Luminar 25mm on bellows + Nikon D5100. Combine Z Photo & collection Chollet Pascal (# 6054)

© Chollet Pascal

Small clusters of white Offretite on matrix. Bought at an exhibition of sales-purchases-exchange of minerals and fossils.

Offretite crystals Photo & collection Vessely

© y vessely

Cluster of transparent, long pristmatic offretite crystals on montmorillonite. The crystals are subparallel bundles of thinner crystals with irregular terminations.

© Volker Betz (2020)

A beautiful piece of Opal found by one of the 3 members of the french crew "Minerhone" on the Mont-Sémiol (see the locality). This piece is just a fragment of a huge more Opal rock, it present different colors (red, yellow, green, brown) Opal were identified by scratching a piece of glass Size : 3x4x3 cm

© Minerhone

Offretite crystals Photo & collection Vessely

© y vessely

Offretite crystals Photo & collection Vessely

© y vessely

Vug in olivine rich basaltic matix lined with clay mineral and with sprays of acicular mazzite-Mg crystals and one small phillipsite crystal at right of center.

© Volker Betz (2022)

Offretite crystals Photo & collection Vessely

© y vessely

Vug in basaltic matrix with sprays of mazzite-Mg. Rich sample.

© Volker Betz (2022)

Vug in basaltic matrix with a spray of acicular mazzite-Mg crystals and pseudoteragonal, prismatic phillipsite twins.

© Volker Betz (2022)

Offretite crystals Photo & collection Vessely

© y vessely

Acicular crystals of mazzite-Mg with phillipsite in a vug of basaltic matrix. Collected 1981. Rich sample for species and location.

© Volker Betz (202)

Cluster of long prismatic offretite crystals with some phillipsite in a vug lined with a thin layer of blue-grey clay minerals.

© Volker Betz (2022)

Exceptional well shaped, colorless, transparent crystal of offretite with some other offretite crystals over a layer of clay minerals in a vug of basaltic matrix. The same vug contains also some small chabazite crystals.

© Volker Betz (2019)