Rich druse of fluorite crystals. This kind of octahedral crystals show a special brilliance due to the multiple growths of small crystals on the faces of the octahedron. This fact gives them a rough surface. Translucent, with good green color and good size. The Berta quarry-mine is in the process of filling and restoration. Not oiled. An old specimen ca. 1985, from Manchion Collection.

Interesting example of goethite with a richness and very remarkable intense iridescences. From the classic mines of Riotinto; collected in 1985, accompanied by old label.

Chrysotile fibrous veins in serpentinized marble from this classic Catalan locality.

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On a matrix of quartz crystals, with azurite, there are numerous fibrous aggregates of malachite crystals. Intense color, good brilliance and silky luster. A very bright piece.

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The extremely glassy, transparent to translucent opal colors range from colorless to very rich orange. A really excellent, sculptural and rich bi-colored large matrix opal example from this locality. Bright neon-green fluorescence. Very old material. Matrix opal specimens of this large size are rare from this Oregon locality.

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This specimen is not a "museum specimen" but for the collectors of this "territory" it has a very good memories. It is a tourmaline, sometimes dravite other schorl, of the pegmatites of the Collserola range, in the area of Tibidabo-Sant Pere Màrtir, in the city of Barcelona. It is one of those pieces that we can not do without if we like our mineralogy. With old label.

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This specimen shows a very sharp celestine crystal of good size, "lanceolated", with several defined rhombohedron faces, translucent and with a visible sky blue color. It is disposed on a matrix with calcite scalenohedral crystals. Celestine crystals from this locality are very appreciated by the collectors of Spanish minerals for their color, brilliance and definition of the faces. Nowadays it is not easy to find crystals with this size and quality from this locality.

Group of sphalerite crystals with very marked parallel and polycrystalline growths, with the predominant forms of the tetrahedron, slightly curved in faces and edges, transparent to translucent and brilliant. Toasted honey color. With the light on the backside it lights up in intense orange (see photo).

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Groups of tabular saléeite to metasaléeite crystal aggregates, with a characteristic greenish-yellow color, transparent to translucent, due to the loss of water. The shade is much more greenish than the autunite.

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Globular groups formed by lamellar crystals of theisite, with a bluish to green color on a matrix of dolomite. It is accompanied by crusts of claraite crystals, of an intense turquoise blue. Also with azurite. Analysis results will be sent to the buyer. Claraite is a rare copper and zinc carbonate which may contain sulfur and/or arsenic. Theisite is a rare copper and zinc arsenate-antimonate that has been described for the first time in this mine in the Catalan Pyrenees. These mineral species are the second citation in Spain.

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Good size... Globular groups formed by lamellar crystals of theisite, with a bluish to green color on a matrix of dolomite. It is accompanied by crusts of claraite crystals, of an intense turquoise blue. Also with azurite and manganese oxides, probably asbolane. Analysis results will be sent to the buyer.
Theisite is a rare copper and zinc arsenate-antimonate that has been described for the first time in this mine in the Catalan Pyrenees. Claraite is a rare copper and zinc carbonate which may contain sulfur and/or arsenic. These mineral species are the second citation in Spain.

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Rich group of microcline crystals, amazonite variety, showing defined faces and edges and a very aerial disposition. The color is quite good and very attractive. From an old Catalan collection.

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Perovskite is an very unusual species, if we add that crystals are in good condition, damage free, and that they were collected in a locality of close to Madrid, the species becomes even more interesting... In this piece highlights a group of perovskite crystals between toasted honey to yellowish tones, cube-shaped, translucent and brilliant. One of them with a good size for the locality. They are accompanied by aggregates of octahedral magnetite crystals. A rarity. Specimen has been repaired consolidating a fissure of the matrix, not afecting crystals.

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Excellent cerussite cyclic twin as a star shape in which one of the crystals predominates. Very aesthetic, between transparent to translucent and with very well defined faces and edges. With a mino rocky matrix. Pictures do not do it justice, better in "person". From this classic Moroccan mines.

An excellent twin of cerussite, partially transparent, with alternating color zoning, slightly smoked. A complete piece, in very good condition for the usual of these specimens, with only a tiny chipping in the upper part and nicks in the base, from my point of view without affecting the beauty of the specimen. Very difficult to find today and really appreciated by collectors.

These are the most fine quality romanèchite specimens ever found in Spain. These botryoidal aggregates show the velvet surface formed by several small romanèchite/pyrolusite crystals (see SEM photo). These specimens has not been treated, only fresh water. Romanèchite shows in fresh fracture the classic grey color. You can observe small but brilliant crystals of pyrolusite on the stalactitic surface. Analysis will be send to the buyer.

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Vladimirite specimens from Aït Ahmane are among the world's best for the species. It is a rare arsenate that forms aesthetic rosettes of tabular to fibrous crystals, very sharp and colorless. They are accompanied by white aragonite and pink talmessite. These specimens were found in the walls near the entrance of the galleries of the 53rd vein of this Moroccan mine. The SEM-EDS analysis will be sent to the buyer.

Vladimirite specimens from Aït Ahmane are among the world's best for the species. It is a rare arsenate that forms aesthetic rosettes of tabular to fibrous crystals, very sharp and colorless. They are accompanied by white aragonite. These specimens were found in the walls near the entrance of the galleries of the 53rd vein of this Moroccan mine. The SEM-EDS analysis will be sent to the buyer.

These specimens are showing a complete pseudomorph of digenite (trigonal, Cu9S5) after pyrite (cubic, FeS2). We can see that crystals preserve the original cubic shape, with slightly curved edges and faces partially covered with greenish-colored malachite. A Spanish curiosity for pseudomorph lovers.

These specimens are showing a complete pseudomorph of digenite (trigonal, Cu9S5) after pyrite (cubic, FeS2). We can see that crystals preserve the original cubic shape, with slightly curved edges and faces partially covered with greenish-colored malachite. A Spanish curiosity for pseudomorph lovers.

Very curious specimen of dolomite from this classic Navarrese locality, which shows a rich group of rhombohedral crystals, some with small negative rhombohedron faces and very sharp edges. They are partially coated with manganese oxides that give them a black and dull surface. This kind of specimens are very unusual in collections.

Group of doubly terminated crystals of pseudomorphic hematite after magnetite, elongated and with defined faces and edges. They show exceptional skeletal growths, very marked and partially coated by recrystallizations of small crystals of lenticular hematite. The crystals were formed in the fumaroles of this enormous Argentinian volcano. The Payún Matrú is a large volcano with an intermediate morphological type between a volcanic shield and a stratovolcano, that is located 530 km from the oceanic fosa and marks the subduction zone of the Nazca plate. Currently this area is a national park and collecting minerals is prohibited.

These specimens of orange-colored baryte are a classic of the mineralogy of the La Unión-Cartagena area. This piece stands out for the intense brightness and a marked color zoning, which shows banded zoning on the tabular crystals, those form aesthetic rosettes. Very elegant specimen.

Group of very well defined cuprite crystals showing very unusual facets both for the species and for this classic locality for the species. They have very well defined faces of the cube and the octahedron, together with those of the dodecahedron. Under intense light the red transparency is observed, but the surface shows a gray patina, the years have passed away. They are placed on a cavity of brilliant calcite crystals. An interesting rarity.

Very rich group of pseudorhombohedral and interpenetrated crystals of malachite, very sharp. It would seem to be primary but in my opinion it is a total pseudomorphic substitution after azurite crystals. The brightness is good, intense green color, forming aesthetic aggregates. They are disposed into cavities of the goethite matrix (limonite) with quartz. Excellent specimens rarely seen in collections.