These crystals show astonishing sharpness of tetrahexahedron faces, together with the less developed cube. Crystals are uncolored (under halogen light) or slightly bluish (under fluorescent light), bright and completely clear and are scattered over an esthetic matrix of white crystals of barite. A high-quality specimen that belonged to the Silvane (Barcelona) collection.

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Bipyramidal crystal of powellite with a good size, very brilliant and well defined faces and edges. With a delicate honey color and some transparence. It is accompanied by stilbite crystals on matrix.

This specimen is showing a very rich group of allanite-(Ce) crystals, disposed randomly on a cavity covered by dolomite and calcite. This mineral with Rare Earth Elements (REE) is a classic for this French quarry, in the Pyrenees. It shows very elongated prismatic crystals, with transparence and brown to toasted honey tones.

From a recent find in the Valentín open pit, we get these hemimorphite specimens showing aggregates of flattened prismatic crystals as aesthetic rosettes. They are partiallly filling cavities in the matrix. These samples have been analyzed and we will send a copy to the buyer.

Group of fluorite crystals with faces and sharp edges. One of them shows a good size for the locality. Its intensely toasted honey color is very particular. Note that it is extremely fluorescent with a yellowish tone. It is accompanied by several tabular crystals of white celestite and a group of calcite. It is difficult to find in the market samples of this mine without damages (this only has a almost invisible small dent) since they "fall down" in the geodes. An aesthtic American classic.

Group of fluorite crystals with echeloned parallel growth, with marked faces and edges and damage free. Its honey color is very particular to this locality. Note that it is extremely fluorescent with a yellowish tone. Accompanied by white celestite crystals and disposed on a matrix with dolomite and calcite. It is difficult to find in the market pieces from this mine without damages, because they use to "fall down" in the vugs. An aesthetic American classic.

A piece with history. This is a specimen of elongated prismatic barite crystals with toasted honey tones and very good transparence. It shows very sharp prismatic and terminal faces. These specimens are uncommon in the market. It comes from the former Daunis (Barcelona) collection. Very representative.

Sulfur crystals from the marble quarries of Carrara are appreciated worldwide for its gem quality. In this specimen, we offer a sulphur crystal perfectly disposed on the marble matrix. This crystal is very rich in complex well-defined rhombic faces. It is uncommon because they appears usually rounded. The brilliance and transparence are incredible. The color is intensely yellow, very characteristic of these Carrara sulfur specimens. An exceptional and definitive displaying sample, very rare on market, considering that in last years it has been found only few specimens of this size and quality. A great opportunity.

A very rich group of pyrite crystals forming a globular aggregate, very brilliant, with an intense color and hinting cubic faces. It is disposed very aerial on the matrix with rhombohedral calcite crystals and yellow fluorite. To increase its aesthetics a single calcite crystal has grown on the pyrite. A unusual specimen for this mine where pyrite is often found in small crystals coating the fluorite.

From a recent find in the Valentín open pit, we get these hemimorphite specimens showing aggregates of flattened prismatic crystals as aesthetic rosettes. They are partiallly filling cavities in the matrix. These samples have been analyzed and we will send a copy to the buyer.

A very rich group of interpenetrated fluorite crystals with cubic forms with beveled edges by the dodecahedron. Very sharp and with a really intense color, that varies depending on the incident light, between blue-violet to purple. A high quality Spanish fluorite specimen, from my own collection.

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Group of tabular barite crystals showing well defined faces and edges, good transparency and excellent brilliance. Its color takes on a greenish gray shades due to inclusions. Observed under the microscope, you could see the presence of reddish acicular inclusions of hematite. This sample was published in the Mineralogical Record (Vol. 45, No. 1) as a novelty in the Munich Mineral Show 2013.

This specimen is from a former Italian collection of early last century, G. d'Anna. It is known that a so called Giusseppe d'Anna of Telve was a military hero of World War I (see minrec). Also accompanying label store minerals Freiberg Mining Academy (more info). This fact and quality make this sample very special. The piece presents a prismatic crystal of cerussite embedded in a galena matrix. A very interesting and historic specimen.

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Group of very sharp cerussite crystals presenting an interesting displaced cyclic twin. The piece, with good size, is a floater, translucent and with an excellent luster. It is very rich in faces and very aesthetic. It comes from the classic Tsumeb mine. With labels from former collections.

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This specimen shows a very rich group of small micaceous crystals of tyuyamunite, brilliant and intense yellow color, contrasting on the matrix. The piece was labeled as francevillite, but we have performed SEM-EDS analysis that refers to the tyuyamunite species. The results indicated the presence of uranium, calcium, vanadium, and few silicium, thus move away from the francevillite containing barium and lead, together with vanadium and uranium. Results will be send to the buyer. From a Spanish mine not well represented in collections.

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We always try to bring pieces from our travels to Switzerland. This curious specimen of siderite from the near Goms area is an example. This is a group of rhombohedral siderite crystals that show a curious and unusual curved parallel growth. They are partially covered by calcite and albite, accompanied by brilliant muscovite. From an unusual Swiss locality.

Group of very sharp fluorite crystals with good transparence and brilliance, with a bluish color, well disposed very aerial on a barite matrix. We would like to emphisize the size of the main crystal and its good definition, showing perfectly tetrahexahedron faces with an interesting slight curvature. A classic from Asturies.

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A huge size cuprian adamite specimen, formed by two druses of very brilliant small crystals with an intense brilliance and characteristic color, with stalactitic growths. On the back size of the specimen there are some isolated and more developed crystals of this arsenate. Really good for diplay.

Euxenite-(Y) is an uncommon oxyde of niobium with tantalum and titanium and Rare Earth Elements (REE), with some calcium and radioactive elements like uranium or thorium. These elements give it a radioactive activity. This specimen we offer you is a cluster of parallel growth crystals, well-formed, with a chisel termination.With the classic ocher patina. A good chance to get this rare species.

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A very rich specimen of silver from a classic locality for the Catalan mineralogy. In this sample we could enjoy several groups of very sharp brilliant skeletal silver crystals. They are accompanied by acanthite aggregates of darker color. The specimen has been acidified with care since usually silver specimens become dark, but in this case, and looking at the date of collection, we can foresee a long stability. The label indicates that this material was mined in 1905, but the specimen was collected in 1998.

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This specimen shows several mineral species. The matrix which "supports" all of them is a group of huge size galena crystals with sharp cube-octahedral faces. Partially covering them we can see large groups of flattened realgar crystals. As alteration of these realgar crystals, due to the light, we have a patina, between yellow to orange, pararealgar. Between these galena crystals some orpiment aggregates, with a very intense yellow color.
We would like to emphisize in this specimen the presence of numerous seligmanite (PbCuAsS3) prismatic crystals, with a luster that makes them stand out. Evidently magnification is necessary to enjoy all their forms. Accompanied by chalcopyrite, pyrite and quartz. As you can see, it is a complete and representative specimen from this Peruvian mine.

In this specimen we can see some matrix cavities covered by botryoidal aggregates formed by wavellite crystals. Different layers of wavellite are observed. Its color is greenish yellow and more bluish in some areas by the presence of turquoise. They are partially covered by several small aggregates of lanceolate turquoise crystals (see photo) with a light blue color.

These wavellite and turquoise specimens have been analyzed by microprobe and we will send the results to the purchaser, with the SEM photograph of both species. Palazuelo de las Cuevas area is known worldwide for variscite, that were worked for making beads in the Neolithic period, it was 5.000 years ago.

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In this specimen we can see some matrix cavities covered by botryoidal aggregates formed by wavellite crystals. Different layers of wavellite are observed. Its color is greenish yellow. They are peppered by small aggregates of turquoise crystals with a light blue color.

These wavellite and turquoise specimens have been analyzed by microprobe and we will send the results to the purchaser, with the SEM photograph of both species. Palazuelo de las Cuevas area is known worldwide for variscite, that were worked for making beads in the Neolithic period, it was 5.000 years ago.

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In this specimen we can see some matrix cavities covered by botryoidal aggregates formed by wavellite crystals. Different layers of wavellite are observed. Its color is greenish yellow and more bluish in some areas by the presence of turquoise. They are partially covered by several small aggregates of lanceolate turquoise crystals (see photo) with a light blue color.

These wavellite and turquoise specimens have been analyzed by microprobe and we will send the results to the purchaser, with the SEM photograph of both species. Palazuelo de las Cuevas area is known worldwide for variscite, that were worked for making beads in the Neolithic period, it was 5.000 years ago.

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A very particular quartz crystal that shows a very marked "window" growths (also called "skeletal") in the rhombohedron faces and with a short prism. Very good glassy luster. With inclusions those are very common in this type of quartz crystals. These specimens were collected near the Urrúnaga reservoir in Legutio. Nowadays it is near impossible find these specimens.