Bílina coal mine, Bílina, Teplice District, Ústí nad Labem Region, Czech Republic

Well formed marcasite with white spray of ferrierite

© Petr Fuchs

Photographer and collection O. Dziallas.

© O. Dziallas 2005

Twin of whewellite, coexisting with tiny (~ 0.5 mm) light orange siderite xls (both PXRD-confirmed).

© Łukasz Kruszewski 2007

Beautiful marcasite sample.

© Petr Fuchs

Whewellite crystals - December of 2006.

© Photo & Collection of Martins da Pedra

Dimensions: 2" x 2" x 1.5" Garnet-red duxite, a variety of amber, on dark lignite.

Field of view about 1cm

© Maurice de Graaf

Nice marcasite tree. FOV 30mm. Collection Z. Dvořák.

© Petr Fuchs

Fossil resin, variety Duxite. Specimen 9x6cm

© Petr Fuchs

Very nice agregate of Arsensulfurite from lignite quarry (area is Kaňkov). FOV 2,5mm Collection Z.Dvořák

© Petr Fuchs

0.6 mm crystal/crystal twin of hartite. Obtained from Jiri Spalek - thanks!

© Łukasz Kruszewski 2007

Fossil resin, variety Duxite. Field of view 2x3cm

© Petr Fuchs

Field of view 4mm

© Petr Fuchs

Beautiful duxite drop inside quartz cavity. FOV 10mm Collection Z.Dvořák, phot P.Fuchs

© Petr Fuchs

size - 2 cm

© Grzegorz Bijak

Whewellite crystals on matrix - December of 2006.

© Photo & Collection of Martins da Pedra

Mellite on siderite. FOV 6mm. Collection Z.Dvořák

© Petr Fuchs

Field of view 4mm

© Petr Fuchs

FOV 25mm. Collection Z.Dvořák

© Petr Fuchs

Octahedral pyrite crystals, possibly with minor marcasite. specimen size is 9 x 8 x 3 LG foto and collection

1.2 cm view of organic mineral hartite associated with unidentified orange rosette-forming blades. Obtained from Jiri Spalek - thanks!

© Łukasz Kruszewski 2007

Zoom of the surface of massive/cryptocrystalline hartite. Field of view is 2.3 mm. Obtained from Jiri Spalek - thanks!

© Łukasz Kruszewski 2007

Siderite on a petrified wood - FOV 6mm. Collection Z.Dvořák

© Petr Fuchs

FOV 30mm. Collection Z.Dvořák

© Petr Fuchs

Whewellite crystals - December of 2006.

© Photo & Collection of Martins da Pedra

Nice champagne colored crystal. Collection Z. Dvořák.

© Petr Fuchs

Perfect drop of Duxite. FOV 9mm. Collection Z.Dvořák, photo P. Fuchs

© Petr Fuchs

Nice Ferrierite-NH4 agregate. Collection Z.Dvořák, foto P. Fuchs FOV 3mm

© Petr Fuchs

Nice bluey calcite crystal on whewellite. FOV 20mm. Collection Z.Dvořák

© Petr Fuchs

FOV 4mm. Collection Z.Dvořák

© Petr Fuchs

FOV 6mm. Collection Z.Dvořák

© Petr Fuchs

Nice marcasite group on sandstone FOV 6mm. Collection Z.Dvořák

© Petr Fuchs

Small crystals of this new zeolite on matrix. Bought on the Liège mineral show 2018 from J. Hyrsl. Collection and photo Erik Vercammen

FOV 30mm.Collection Z.Dvořák

© Petr Fuchs

White to clear, flattened crystals of hartite. Former Jaroslav Hyrsl collection. Rolf Luetcke specimen and photo.

Very nice baryte from hill Kaňkov. FOV 10mm Collection Z.Dvořák, photo P.Fuchs

© Petr Fuchs

FOV 30mm. Collection Z.Dvořák

© Petr Fuchs

FOV 45mm. Olympus E-5 / Zuiko Digital ED50mm

© Yaiba Sakaguchi

Nice pyrite group on quartzite. FOV 8mm Collection Z.Dvořák, photo P.Fuchs

© Petr Fuchs

Pyramids like a in Egypt. FOV 30mm. Collection Z.Dvořák

© Petr Fuchs

Very nice rose 12mm across. Collection Z.Dvořák

© Petr Fuchs

© Maggie Wilson

© Robert Vano

Nice baryte twin. FOV 15mm Collection Z.Dvořák, photo P.Fuchs

© Petr Fuchs

3,9cm x 3,2cm Metallic yellow crystals with strong luster are symmetrically twinned in two directions on 90 degree.

© Quebul Fine Minerals

Ferrierite-NH4 spray on small marcasite

© Petr Fuchs

FOV 36mm. Collection Z.Dvořák

© Petr Fuchs

Perfect drop of Duxite. FOV 9mm. Collection Z.Dvořák, photo P. Fuchs

© Petr Fuchs

4,5cm x 3,4cm A yellow crystal with strong metallic luster, symmetrically twinned in two directions on 90 degree.

© Quebul Fine Minerals

A champagne-colored transparent twinned whewellite. Collection and photo by Gianfranco Ciccolini. Nikon D750, bellows, Luminar 45 mm.

White to clear, flattened crystals of hartite. Former Jaroslav Hyrsl collection. Rolf Luetcke specimen and photo.

nice calcite vein with opal coating. Found in bedrock basalt

© Roman Gramblicka

grey-blue opal from veins in altered basalt body in bedrock

© Roman Gramblicka

Whewellite twin on Siderite rhombohedrons. Collection and photo Stephan Wolfsried. Sony Alpha 7R ii, bellows, Mitutoyo M Plan 10x, aperture, Raynox DCR-250 retro, Stack-Master linear actor, stack shot control.

© Stephan Wolfsried 4/2017

Nice pyrite group,FOV 5mm Collection Z.Dvořák, photo P.Fuchs

© Petr Fuchs

greyish blue opal vein in bedrock basalt

© Roman Gramblicka

3.0 x 2.2 x 1.8 cm overall

© Maggie Wilson

5,4cm x 3,3cm Metallic yellow crystal with strong luster.

© Quebul Fine Minerals

White crystals of ferrierite NH4 FOV 4 mm Obtained with Dr Jaroslav Hyrsl Collection and Photo : Vincent Bourgoin

© Vincent Bourgoin 2018

FOV 25mm. Collection Z.Dvořák

© Petr Fuchs

one of best specimens from this find, well developed into space, but too much cracky

© Roman Gramblicka

3.0 x 2.2 x 1.8 cm overall

© Maggie Wilson

Sony Alpha 7R ii, bellows, Mitutoyo M Plan 10x, aperture, Raynox DCR-250 retro, Stack-Master linear actor, stack shot control. Amber (var. Duxite) built from hydrocarbon of this coal deposit. Collection and photo Stephan Wolfsried

© Stephan Wolfsried 2/2017

Metallic crystal Marcasite; Photo and collection Fernando Brederodes.

nice miniature with dominant baryte crystal. Specimen comes from the last great baryte occurrence from southern slopes of brown coal open pit Bílina

© Roman Gramblicka

3.0 x 2.2 x 1.8 cm overall

© Maggie Wilson

White to clear, flattened crystals of hartite. Former Jaroslav Hyrsl collection. Rolf Luetcke specimen and photo.

© Roman Gramblicka

9.5 x 7.8 x 6.8 cm. A sculptural, unusual style of arborescent marcasite crystals from the well-known lignite coal mines of this Czech region. Lustrous, brassy, densely stepped-growth crystal spear-points compose this striking tree-like crystal cluster. Most marcasite specimens featured in the MINDAT photo gallery for the Region have striking, ...

© Rob Lavinsky & MineralAuctions.com

Chalcedony from a new find in basaltic body in bedrock

© Roman Gramblicka

nice rainbow-coloured pyrite balls sitting on brown coal

© Roman Gramblicka

Ferrierite-NH4 - a recently discovered likely second ammonium-dominant zeolite (after ammonioleucite). I assume there is no accident in the occurrence of such ammonian mineral in a nearby a coal deposit. Coal is a well-known source of ammonium ions which is often marked by the common occurrence of salammoniac and ammonium-rich sulfates (and, ...

© Łukasz Kruszewski 2019

Colourless thin tabular crystals of Ferrierite-NH4. Sony Alpha 7R ii.StackUnit.Mitutoyo Plan Apo X 20 /Achromatic doublet retro/ Aperture. Photo & Collection Christophe Boutry.

© Christophe Boutry

Well formed marcasite on sandstone.

© Petr Fuchs