Chabazite-K, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A rosette of flattened crystals of chabazite-K, variety phacolite. At the bottom and on the right side, small crystals of colorless phillipsite-K. Collection and photo of Gianfranco Ciccolini.

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

White balls about 1 mm in diameter Collection and photo: Roberto Bosi

© Roberto Bosi

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Flower-like aggregate of white crystals of chabazite-K. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, Schneider Kreuznach 35mm; f: 4. Focal using 5.6.

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Four crystal groups of white to colorless chabazite-K. Doug Merson photo and collection.

© 2017 Doug Merson

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Crystals size is 2-3 mm. Photo and collection: Giovanni Fraccaro.

© Giovanni Fraccaro

Nepheline, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Hexagonal prism of nepheline with a tetragonal prism of melilite growing out of it. Image is about 4.1 mm in length. Specimen was obtained at the 2009 London, Ontario Gem and Mineral Show. An old label glued to the bottom of the thumbnail box indicates ex-R. Tschernich collection. Photo and specimen: Steve Stuart.

© SMS 2009

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In my opinion, the photo depicts a stemple twin, composed of morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, other second-generation phillipsite-K crystals have grown. Collection and photo of Gianfranco Ciccolini.

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A 4.6 x 4.0 x 2.2 cm matrix, the top coated by sparkling white crystals of gismondine to 0.3 cm scattered over micro crystals of phillipsite-K.

© Dan & Diana Weinrich Minerals

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Pseudo octahedral crystal of gismondine, and prismatic crystals of phillipsite-K grown all around the crystal gismondine, and also, in epitaxy, on the faces of the same crystal. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, APO Rodagon 50 mm; f: 2.8. Focal using 5.6.

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Beautiful white crystals, tabular, thin, twisted to form rosettes; fluorescent light yellow under shortwave ultraviolet light. The basalt matrix is clear (at Vallerano is darker). I purchased the specimen from Mr. Liotti in 1996. Collection and photo of Gianfranco Ciccolini.

Phillipsite-K, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Colorless and transparent aggregate of prismatic, cruciform twins of phillipsite-K. On yellow crystals of a melilite-group mineral. Collection and photo of Gianfranco Ciccolini.

Gismondine-Ca

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Field of view is 4 mm Photo and collection: Antonio Borrelli

© Antonio Borrelli

Baryte, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Aggregates of milky-white tabular crystals of baryte, on acicular crystals of vonsenite.

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Aggregate of numerous colorless, prismatic, twinned crystals of phillipsite-K. Collection and photo, of Gianfranco Ciccolini. Nikon D610, bellows, Schneider Kreuznach 35mm; f: 4. Focal using 5.6.

Gismondine Subgroup, Phillipsite-K, Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

White, glassy crystals of 'gismondine', with small crystals of phillipsite-K epitaxially grown on 'gismondine' and, above, on the right a small colorless crystal of chabazite-K, variety phacolithe. The 2.2 mm measure refers to the aggregate. Ex Liotti collection and now in the collection of Gianfranco Ciccolini, author of the photo .

Gismondine Subgroup, Chabazite-K, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The multi-twinned crystal of "phillipsite", colorless and transparent, has an evident cross with recessed corners. It grew on small weathered, yellowish, hexagonal crystals of nepheline and dark green-black crystals of augite. Collection and photo by Gianfranco Ciccolini. Nikon D750, bellows, Luminar 45 mm.

Gismondine Subgroup, Phillipsite Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A 4.6 x 4.0 x 2.2 cm matrix, the top coated by sparkling white crystals of gismondine to 0.3 cm scattered over micro crystals of phillipsite-K.

© Dan & Diana Weinrich Minerals

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In my opinion, the photo depicts a stemple twin, composed of morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, other second-generation phillipsite-K crystals have grown. It is the same twin, seen from another perspective. Collection and photo of ...

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The same crystal seen from another perspective. Pseudo octahedral crystal of gismondine, and prismatic crystals of phillipsite-K grown all around the crystal gismondine, and also, in epitaxy, on the faces of the same crystal. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, APO Rodagon 50 mm; f: 2.8. Focal using 5.6.

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Typical epitaxy of colorless phillipsite-K crystals on a pseudo octahedral crystal of 'gismondine'. Gianfranco Ciccolini collection and photo.

Gismondine-Ca, Phillipsite-K, Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In the center of the photo a twinned crystal of gismondine-Ca, with epitactic accretions of phillipsite-K in small crystals and all around spheres of chabazite-K crystals. Collection and photo by Gianfranco Ciccolini. Nikon D850, two bellows, Scheider Kreuznach Componon 80 mm; f: 5.6. Focal using 7.

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In my opinion, the photo depicts a stemple twin, composed of morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, other second-generation phillipsite-K crystals have grown. It is the same twin, seen from another perspective. Collection and photo of ...

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.6 x 6.0 x 5.0 cm. Phillipsite is a fairly rare member of the zeolite family that at times can have calcium, or potassium, or sodium as its chief constituent. The phillipsite is found coating brecciated basalt, and the mm-size crystals form botryoidal clusters up to 4 mm across. These spheres are snow white, and lustrous. There may also possibly ...

© Rob Lavinsky & irocks.com

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Gismondine Subgroup, Phillipsite-K, Chabazite-K, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

An interesting combination of several mineral species in a single specimen. On the right a pseudo octahedral crystal of 'gismondine' (1.2 mm), with colorless crystals of phllipsite-K epitaxially grown on all four faces of the crystal of 'gismondine'. Smaller, twinned, colorless crystals of phillipsite-K are present in the lower part of the photo, ...

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The multi-twinned crystal of "phillipsite", colorless and transparent, has an evident cross with recessed corners. It grew on small weathered, yellowish, hexagonal crystals of nepheline and dark green-black crystals of augite. Collection and photo by Gianfranco Ciccolini. Nikon D750, bellows, Luminar 45 mm.

Phillipsite-K, Gismondine-Ca, Calcite, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

On the right, a multi-twinned prismatic, shiny, colorless phillipsite-K crystals, on whose prismatic faces a twinned pseudo-octahedral crystal of gismondine-Ca has grown (in my opinion), on whose faces in turn there are small phillipsite-K crystals, probably epitactic, best visible in the child photo. To the right, at the base of the phillipsite-K ...

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Specimen size is 35x18x16mm Micro nodules of colourless to white gismondine crystals (to 2mm) in dark grey basalt.

© Keith F Compton

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The photo shows three Stemple twins, composed of Morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, additional second-generation phillipsite-K crystals have grown. The child photo shows, more clearly, the Stemple twin composed of Morvenite twins. ...

Vonsenite, Calcite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A network-like aggregate of pink to black acicular crystals of vonsenite, with small colorless crystals of calcite in chain-like aggregates. Note circular holes in this vonsenite network, as if these thread-like aggregates have grown around crystals, which were subsequently dissolved. Gianfranco Ciccolini collection, author of the photo. Nikon ...

Phillipsite-K, Gismondine-Ca, Calcite, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

On the right, a multi-twinned prismatic, shiny, colorless phillipsite-K crystals, on whose prismatic faces a twinned pseudo-octahedral crystal of gismondine-Ca has grown (in my opinion), on whose faces in turn there are small phillipsite-K crystals, probably epitactic, best visible in the child photo. To the right, at the base of the phillipsite-K ...

Gismondine Subgroup, Chabazite, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Gismondine Subgroup, Chabazite, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Gismondine Subgroup, Chabazite, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

"Icy roses" Rounded sprays of white-vitreous crystals up to 2 mm on dark basalt. From an exchange at Novara Mineral Fair, 1991. Photo and collection: Alessandro Cantamessa (#547).

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Crystal size is 0.4 mm Collection and photo: Roberto Bosi

© Roberto Bosi

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A 2.5-mm-long crystal. Ex Igino Caponera. Photo and collection: A.Tagliaferri

© Alessandro Tagliaferri

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.6 x 6.0 x 5.0 cm. Phillipsite is a fairly rare member of thezZeolite family that at times can have calcium, or potassium, or sodium as its chief constituent. The phillipsite is found coating brecciated basalt, and the mm-size crystals form botryoidal clusters up to 4 mm across. These spheres are snow white, and lustrous. There may also possibly ...

© Rob Lavinsky & irocks.com

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.6 x 6.0 x 5.0 cm. Phillipsite is a fairly rare member of the zeolite family that at times can have calcium, or potassium, or sodium as its chief constituent. The phillipsite is found coating brecciated basalt, and the mm-size crystals form botryoidal clusters up to 4 mm across. These spheres are snow white, and lustrous. There may also possibly ...

© Rob Lavinsky & irocks.com

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Phillipsite-K crystals with evident striations typical of Marburg twins, both with and without re-entrant angles. On the left a Stemple twin composed of Marburg twins on two axes. The child photo shows a close-up of these Marburg twins. Gianfranco Ciccolini collection, author of the photo. Nikon D850, bellow, Luminar 40 mm.

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The photo shows three Stemple twins, composed of Morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, additional second-generation phillipsite-K crystals have grown. The child photo shows, more clearly, the Stemple twin composed of Morvenite twins. ...

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

"Icy roses" Rounded sprays of white-vitreous crystals up to 2 mm on dark basalt. From an exchange at Novara Mineral Fair, 1991. Photo and collection Alessandro Cantamessa (#547).

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Aggegates of small crystals of gismondine from Osa Quarry, Rome, Italy

© Knut Eldjarn

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Beautiful aggregate of colourless, sharp phillipsite crystals in a cavity in matrix. The specimen is catalogued as gismondine, but this photo shows what is presumably phillipsite (visual ID based on crystal shape). Purchased in 1982.

© Andrew Hodgson

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Phillipsite-K crystals with evident striations typical of Marburg twins, both with and without re-entrant angles. On the left a Stemple twin composed of Marburg twins on two axes. The child photo shows a close-up of these Marburg twins. Gianfranco Ciccolini collection, author of the photo. Nikon D850, bellow, Luminar 40 mm.

Chabazite-K, Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Multiple twin spheres of Chabazite-K associated with pseudo octahedral crystals of Gismondine. Collection & Photo: Marco Ballati.

Gismondine Subgroup, Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Part of a vug with hemisperical chabazite-K and gismondine.

© Volker Betz (2026)

Chabazite-K, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A rosette of flattened crystals of chabazite-K, variety phacolite. At the bottom and on the right side, small crystals of colorless phillipsite-K. Collection and photo of Gianfranco Ciccolini.

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

White balls about 1 mm in diameter Collection and photo: Roberto Bosi

© Roberto Bosi

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Flower-like aggregate of white crystals of chabazite-K. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, Schneider Kreuznach 35mm; f: 4. Focal using 5.6.

Nepheline, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Hexagonal prism of nepheline with a tetragonal prism of melilite growing out of it. Image is about 4.1 mm in length. Specimen was obtained at the 2009 London, Ontario Gem and Mineral Show. An old label glued to the bottom of the thumbnail box indicates ex-R. Tschernich collection. Photo and specimen: Steve Stuart.

© SMS 2009

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Four crystal groups of white to colorless chabazite-K. Doug Merson photo and collection.

© 2017 Doug Merson

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Crystals size is 2-3 mm. Photo and collection: Giovanni Fraccaro.

© Giovanni Fraccaro

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A 4.6 x 4.0 x 2.2 cm matrix, the top coated by sparkling white crystals of gismondine to 0.3 cm scattered over micro crystals of phillipsite-K.

© Dan & Diana Weinrich Minerals

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In my opinion, the photo depicts a stemple twin, composed of morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, other second-generation phillipsite-K crystals have grown. Collection and photo of Gianfranco Ciccolini.

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Pseudo octahedral crystal of gismondine, and prismatic crystals of phillipsite-K grown all around the crystal gismondine, and also, in epitaxy, on the faces of the same crystal. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, APO Rodagon 50 mm; f: 2.8. Focal using 5.6.

Phillipsite-K, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Colorless and transparent aggregate of prismatic, cruciform twins of phillipsite-K. On yellow crystals of a melilite-group mineral. Collection and photo of Gianfranco Ciccolini.

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Beautiful white crystals, tabular, thin, twisted to form rosettes; fluorescent light yellow under shortwave ultraviolet light. The basalt matrix is clear (at Vallerano is darker). I purchased the specimen from Mr. Liotti in 1996. Collection and photo of Gianfranco Ciccolini.

Gismondine-Ca

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Field of view is 4 mm Photo and collection: Antonio Borrelli

© Antonio Borrelli

Baryte, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Aggregates of milky-white tabular crystals of baryte, on acicular crystals of vonsenite.

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Aggregate of numerous colorless, prismatic, twinned crystals of phillipsite-K. Collection and photo, of Gianfranco Ciccolini. Nikon D610, bellows, Schneider Kreuznach 35mm; f: 4. Focal using 5.6.

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The multi-twinned crystal of "phillipsite", colorless and transparent, has an evident cross with recessed corners. It grew on small weathered, yellowish, hexagonal crystals of nepheline and dark green-black crystals of augite. Collection and photo by Gianfranco Ciccolini. Nikon D750, bellows, Luminar 45 mm.

Gismondine Subgroup, Phillipsite-K, Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

White, glassy crystals of 'gismondine', with small crystals of phillipsite-K epitaxially grown on 'gismondine' and, above, on the right a small colorless crystal of chabazite-K, variety phacolithe. The 2.2 mm measure refers to the aggregate. Ex Liotti collection and now in the collection of Gianfranco Ciccolini, author of the photo .

Gismondine Subgroup, Chabazite-K, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Gismondine Subgroup, Phillipsite Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A 4.6 x 4.0 x 2.2 cm matrix, the top coated by sparkling white crystals of gismondine to 0.3 cm scattered over micro crystals of phillipsite-K.

© Dan & Diana Weinrich Minerals

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In my opinion, the photo depicts a stemple twin, composed of morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, other second-generation phillipsite-K crystals have grown. It is the same twin, seen from another perspective. Collection and photo of ...

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The same crystal seen from another perspective. Pseudo octahedral crystal of gismondine, and prismatic crystals of phillipsite-K grown all around the crystal gismondine, and also, in epitaxy, on the faces of the same crystal. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, APO Rodagon 50 mm; f: 2.8. Focal using 5.6.

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In my opinion, the photo depicts a stemple twin, composed of morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, other second-generation phillipsite-K crystals have grown. It is the same twin, seen from another perspective. Collection and photo of ...

Gismondine Subgroup, Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Typical epitaxy of colorless phillipsite-K crystals on a pseudo octahedral crystal of 'gismondine'. Gianfranco Ciccolini collection and photo.

Gismondine-Ca, Phillipsite-K, Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

In the center of the photo a twinned crystal of gismondine-Ca, with epitactic accretions of phillipsite-K in small crystals and all around spheres of chabazite-K crystals. Collection and photo by Gianfranco Ciccolini. Nikon D850, two bellows, Scheider Kreuznach Componon 80 mm; f: 5.6. Focal using 7.

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.6 x 6.0 x 5.0 cm. Phillipsite is a fairly rare member of the zeolite family that at times can have calcium, or potassium, or sodium as its chief constituent. The phillipsite is found coating brecciated basalt, and the mm-size crystals form botryoidal clusters up to 4 mm across. These spheres are snow white, and lustrous. There may also possibly ...

© Rob Lavinsky & irocks.com

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The multi-twinned crystal of "phillipsite", colorless and transparent, has an evident cross with recessed corners. It grew on small weathered, yellowish, hexagonal crystals of nepheline and dark green-black crystals of augite. Collection and photo by Gianfranco Ciccolini. Nikon D750, bellows, Luminar 45 mm.

Gismondine Subgroup, Phillipsite-K, Chabazite-K, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

An interesting combination of several mineral species in a single specimen. On the right a pseudo octahedral crystal of 'gismondine' (1.2 mm), with colorless crystals of phllipsite-K epitaxially grown on all four faces of the crystal of 'gismondine'. Smaller, twinned, colorless crystals of phillipsite-K are present in the lower part of the photo, ...

Nepheline, Leucite, Melilite Group

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The specimen measures 73 mm in length. Grzegorz Słowik collection and photo.

© Grzegorz Słowik

Phillipsite-K, Gismondine-Ca, Calcite, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

On the right, a multi-twinned prismatic, shiny, colorless phillipsite-K crystals, on whose prismatic faces a twinned pseudo-octahedral crystal of gismondine-Ca has grown (in my opinion), on whose faces in turn there are small phillipsite-K crystals, probably epitactic, best visible in the child photo. To the right, at the base of the phillipsite-K ...

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Specimen size is 35x18x16mm Micro nodules of colourless to white gismondine crystals (to 2mm) in dark grey basalt.

© Keith F Compton

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The photo shows three Stemple twins, composed of Morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, additional second-generation phillipsite-K crystals have grown. The child photo shows, more clearly, the Stemple twin composed of Morvenite twins. ...

Gismondine Subgroup, Chabazite, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Vonsenite, Calcite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A network-like aggregate of pink to black acicular crystals of vonsenite, with small colorless crystals of calcite in chain-like aggregates. Note circular holes in this vonsenite network, as if these thread-like aggregates have grown around crystals, which were subsequently dissolved. Gianfranco Ciccolini collection, author of the photo. Nikon ...

Phillipsite-K, Gismondine-Ca, Calcite, Vonsenite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

On the right, a multi-twinned prismatic, shiny, colorless phillipsite-K crystals, on whose prismatic faces a twinned pseudo-octahedral crystal of gismondine-Ca has grown (in my opinion), on whose faces in turn there are small phillipsite-K crystals, probably epitactic, best visible in the child photo. To the right, at the base of the phillipsite-K ...

Gismondine Subgroup, Chabazite, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Gismondine Subgroup, Chabazite, Aragonite

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.5 x 6.2 x 5.8 cm. A rare large zeolite combination specimen from this extinct Rome lava flow quarry. The sculptural vug holds glassy, colorless balls of bipyramidal gismondine crystals to 9 mm, fewer and smaller snow-white chabazite-K balls, all resting on tufts of golden-brown aragonite needles. The aragonite has brilliant white fluorescence. ...

© Rob Lavinsky & irocks.com

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

"Icy roses" Rounded sprays of white-vitreous crystals up to 2 mm on dark basalt. From an exchange at Novara Mineral Fair, 1991. Photo and collection: Alessandro Cantamessa (#547).

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.6 x 6.0 x 5.0 cm. Phillipsite is a fairly rare member of thezZeolite family that at times can have calcium, or potassium, or sodium as its chief constituent. The phillipsite is found coating brecciated basalt, and the mm-size crystals form botryoidal clusters up to 4 mm across. These spheres are snow white, and lustrous. There may also possibly ...

© Rob Lavinsky & irocks.com

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Crystal size is 0.4 mm Collection and photo: Roberto Bosi

© Roberto Bosi

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

A 2.5-mm-long crystal. Ex Igino Caponera. Photo and collection: A.Tagliaferri

© Alessandro Tagliaferri

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

10.6 x 6.0 x 5.0 cm. Phillipsite is a fairly rare member of the zeolite family that at times can have calcium, or potassium, or sodium as its chief constituent. The phillipsite is found coating brecciated basalt, and the mm-size crystals form botryoidal clusters up to 4 mm across. These spheres are snow white, and lustrous. There may also possibly ...

© Rob Lavinsky & irocks.com

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Phillipsite-K crystals with evident striations typical of Marburg twins, both with and without re-entrant angles. On the left a Stemple twin composed of Marburg twins on two axes. The child photo shows a close-up of these Marburg twins. Gianfranco Ciccolini collection, author of the photo. Nikon D850, bellow, Luminar 40 mm.

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

The photo shows three Stemple twins, composed of Morvenite twins on two axes (see: Zeolites of the world, written by Rudy W. Tschernich, figure 500, page 407, Geoscience Press). On the terminations, additional second-generation phillipsite-K crystals have grown. The child photo shows, more clearly, the Stemple twin composed of Morvenite twins. ...

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Beautiful aggregate of colourless, sharp phillipsite crystals in a cavity in matrix. The specimen is catalogued as gismondine, but this photo shows what is presumably phillipsite (visual ID based on crystal shape). Purchased in 1982.

© Andrew Hodgson

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

"Icy roses" Rounded sprays of white-vitreous crystals up to 2 mm on dark basalt. From an exchange at Novara Mineral Fair, 1991. Photo and collection Alessandro Cantamessa (#547).

Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Aggegates of small crystals of gismondine from Osa Quarry, Rome, Italy

© Knut Eldjarn

Phillipsite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Phillipsite-K crystals with evident striations typical of Marburg twins, both with and without re-entrant angles. On the left a Stemple twin composed of Marburg twins on two axes. The child photo shows a close-up of these Marburg twins. Gianfranco Ciccolini collection, author of the photo. Nikon D850, bellow, Luminar 40 mm.

Chabazite-K, Gismondine Subgroup

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Multiple twin spheres of Chabazite-K associated with pseudo octahedral crystals of Gismondine. Collection & Photo: Marco Ballati.

Gismondine Subgroup, Chabazite-K

Osa Quarry, Osteria dell'Osa, Rome, Metropolitan City of Rome Capital, Lazio, Italy

Part of a vug with hemisperical chabazite-K and gismondine.

© Volker Betz (2026)