Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

200 €

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La dadsonita es un raro cloro-sulfoantimoniuro de plomo (1 átomo de cloro por cada 60 de azufre), composicionalmente difiere de la boulangerita por este anión de cloro. En la zona de las "bad-lands" de Sant Ponç (o Saint-Pons) se encuentran niveles lenticulares de siderita y calcita. La formación de esta rara sulfosal se basa en la redisolución de otras sulfosales en presencia de cloruros.
Las finas agujas de dadsonita suelen aparecen incluídas en calcita, junto con boulangerita. Una vez la calcita se elimina mediante procesos químicos als finas agujas afloran en toda su belleza. También se la puede encontrar formando agregados radiales en cavidades de la matriz. Probablemente, la dadsonita de Sant Ponç puede considerarse entre las mejores del mundo.

160 €

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Anglesite specimens from this classic Moroccan mine are quite difficult to find. In this piece we can see numerous lanceolated prismatic crystals of this lead sulphate, very brilliant, with well defined faces and edges, transparent and showing the natural yellow colour characteristic of this species and mine. They are disposed filling cavities in a galena matrix.

Cluster of aragonite crystals, very bright and defined. They are known in the area as "sputnik stones" (sic) because of their appearance. They present a color zoning on the surface, between gray and brown. They are floating. A Moroccan curiosity.

Cluster of aragonite crystals, very bright and defined. They are known in the area as "sputnik stones" (sic) because of their appearance. They present a color zoning on the surface, between gray and brown. They are floating. A Moroccan curiosity.

Group of good-sized sulphur crystals from a classic Spanish locality, but from a little-known mine, showing a great richness of faces, some brilliance and a canary yellow color. It is arranged in a cavity with calcite crystals. A fine Spanish specimen.

Contrasting sparkly dolomite matrix are lustrous, dark green spheres to 1 mm across, of conichalcite. This is an uncommon, calcium, copper arsenate and it is rare in the form of such isolated crystals or crystal aggregates as you see here (forming little ball-shaped growths).This aesthetic specimen is double sided.

Very elongated quartz crystal, very rich in faces, with excellent transparence. Rock crystal...

Very elongated quartz crystal with a very uniform and aesthetic smoky tone. Defined faces and edges and good transparence.

Laminar crystals of kyanite, with a bluish tone, from this deposit located on the road between Canillas del Aceituno and Sedella. This specimen belongs from the Peter Seroka collection and is accompanied by the label.

60 €

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Excellent specimen of hydroboracite, with a very good size, formed by numerous radial aggregates of acicular crystals. Very good brilliance, transparence and with color zoning, between colorless to slightly honeyed. This specimen has a former owner's handwritten label. A display museum specimen.

160 €

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These specimens from the Siglo XX Mine present defined, brilliant, translucent and light orange colour monazite-(Ce) crystals. They are accompanied by hyaline quartz and black-brown cassiterite on matrix. Some are twinned. Monazite is found in small quantities in this mine.
Monazite gets its name from the Greek word μουάζω "monazein" meaning "to be alone," alluding to its isolated crystals and their rarity when they were first found. Monazite is generally found in granitic pegmatites, but these crystals are found in hydrothermal veins with tin and the absence of thorium (generally an accompanying element of monazite).

190 €

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Group of twinned prismatic scolecite crystals, very brilliant and transparent. It is accompanied by small hyaline crystals of fluorapophyllite-(K), bright and very defined. Scolecite is a rather rare species of the zeolite group from India. With handwritten label by J. Viñals and belonged to the Nicolau collection (Barcelona).

190 €

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Excellent specimen formed by numerous colorless acicular crystals of bultfonteinite, a rare hydrated calcium fluorosilicate, which is accompanied by beige prismatic crystals of olmiite, a hydroxysilicate of calcium and manganese. The specimen is very representative of these species. This is the type locality for olmiite. We include pooldervaartite because it is very common since it forms a series with olmiite.

220 € 150 €

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Group of prismatic celestine crystals, of very good size and from a classic Spanish locality for the species. It occurs in crystals defined by orthorhombic prisms of different orders. Translucent, brilliant and with a soft bluish tone. It belongs from the E. Nicolau collection (Barcelona), labeled by J. Viñals.

80 €

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A great sample of arsenopyrite, pale gold to silver in colour with slight iridenscence and a bright metallic lustre, with several intergrown crystals all showing complex striations and serated crystal edges. Accompanied by black ferberite. Good sized and fine specimen.

Group of tabular crystals of calcite of hexagonal shape, with color zoning and small recrystallizations of the same calcite in some areas of the piece. Crystals are on a matrix with fluorite, quartz and small pyrite crystals. It shows a intense reddish tone under UV light. Aesthetic specimen from this classic Moroccan locality.

60 €

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A very attractive large specimen of beautiful "star" muscovite mica from Linópolis. These specimens are some of the most distinctive and eye-catching pieces of mica from any locality for their wonderful morphology. This piece has a full coverage of lovely golden-yellow color, incredibly well-formed, star shaped twinned crystals of muscovite on quartz matrix.

Aesthetic group of topaz crystals aesthetically disposed on a rhyolite matrix. Some of them isolated and very rich in faces. They show very well defined faces and edges, with an excellent transparency and a uniform tone. From a classic locality.

Highly lustrous, rounded faces, jet-black spinel octahedrons included in a calcite matrix from this less well-known locality. Crystals of this size and quality are rare from here and this is a fine and good sized specimen from the E. Nicolau (Barcelona) Collection.

Interesting specimen due to the town where it comes from. It is a druse (both sides) of small, brilliant jarosite crystals from this small ballast quarry for railway tracks, located in the area known as "La Corraliza" to the NNE of the town of Vall d'Uixó. With old label from J. Viñals.

45 €

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Globular aggregates of prismatic baryte crystals, bright, defined, translucent and with a whitish color. A classic of Murcian mining.

In this specimen we can observe several cubic galena crystals, very brilliant and defined, with faces of the cube truncated by the octahedron. They are accompanied by complex sphalerite spinel twin crystals. Disposed on a matrix with quartz and lenticular calcite crystals.

Scalenohedral rhodo crystals with a whitish patina. They are accompanied by very brilliant hyaline quartz crystals.

Group of cubic fluorite crystals, with transparence that allows us to see the inner violet geometric zoning. Polysynthetic growths on faces. In matrix with baryte.