Cronstedtite is a rare iron silicate of the kaolinite-serpentine group. This is a good representative of the cronstedtite specimens from this classic Spanish mine. It shows a lustrous, black, trigonal crystals forming groups on the matrix. It is a rare oportunity to get good specimens of this species.

These calcite specimens were found in a pocket in the El Americano (Can Sala) mine-quarries, in the Montseny mountains. This big geode was called "Mercedes" due to the curious color zoning that can be observed at the terminal rhombohedrons faces reminiscent of the German automobile company logo.
Crystals appeared partially coated by carbonated iron oxides and sometimes showed a complex prism, sometimes growing on scalenohedral crystals (like this specimen). This calcite shows a intense fluorescence under UV light. These pieces have disappeared from the market.

These calcite specimens were found in a pocket in the El Americano (Can Sala) mine-quarries, in the Montseny mountains. This big geode was called "Mercedes" due to the curious color zoning that can be observed at the terminal rhombohedrons faces reminiscent of the German automobile company logo.
Crystals appeared partially coated by carbonated iron oxides and sometimes showed a complex prism, sometimes growing on scalenohedral crystals. This calcite shows a intense fluorescence under UV light. These pieces have disappeared from the market.

These calcite specimens were found in a pocket in the El Americano (Can Sala) mine-quarries, in the Montseny mountains. This big geode was called "Mercedes" due to the curious color zoning that can be observed at the terminal rhombohedrons faces reminiscent of the German automobile company logo.
Crystals appeared partially coated by carbonated iron oxides and sometimes showed a complex prism, sometimes growing on scalenohedral crystals. This calcite shows a intense fluorescence under UV light. These pieces have disappeared from the market.

Very esthetic group of fluorite crystals, transparent, with brilliance and very sharp faces and edges, showing forms the cube with the dodecahedron. Violet to bluish tone with color zoning. A miniature from a classic Spanish locality.

Very esthetic group of fluorite crystals, very transparent, with dull luster and very sharp faces and edges, showing forms the cube with the dodecahedron and small trapezohedron. Violet tone color zoning. On a small quartz matrix. From a classic locality.

Small specimen of fluorite formed by a group of colorless crystals, translucent, dull and showing forms of the cube and the dodecahedron. A representative miniature.

Very esthetic group of fluorite crystals, very transparent, with brilliance and very sharp faces and edges, showing forms the cube with the dodecahedron and small trapezohedron. Violet tone color zoning. From a classic locality.

A former bornite specimen of this classic locality for the species. We observe two crystals with a good size and rounded faces and edges. They show an excellent luster and aesthetic iridescence. They are accompanied by a chalcopyrite in a matrix of calcite. A piece with history for the best display.

Sized elbaite-liddicoatite crystal, well defined, very aerial disposed, intense bourdeos red color, visible on the transparencies. It shows a striated prism faces with defines rhombohedral top faces. It shows a small dent that does not affect the aesthetics. On a feldspar matrix with sharp londonite crystals.

An aesthetic amethyst group of quartz (var. amethyst) crystals, very aerial disposed, with an exceptional brilliance, and showing geometric color zoning, ghost shape. A miniature with a great quality. A classic from a Mexican locality.

An aesthetic specimen of twinned cassiterite crystals, lustrous, striated, deep black very aerial disposed on a schist matrix with muscovite plates. This excellent piece is from a classic Spanish locality for cassiterite.

A true classic Norwegian classic. A very sharp hydroxylapatite specimen, very rich in faces and with a white color. The crystal is complete all-around and perfectly disposed on the matrix. These specimens are very appreciated by collectors due to nowadays is difficult find them on the market.

Group of datolite crystals, very rich in faces, translucent-white and well defined. They are on a matrix with calcite and quartz, with some epidote-clinozoisite. A piece of a well-known Spanish quarry from where nowadays is very difficult obtain samples because they are not making new blastings.

Brilliant, transparent to translucent, tabular baryte crystals on edge are aesthetically and partially covered by colorful, rich orange color, orpiment botryoids from this classic Peruvian mine. With a few gemmy, blood-red realgar prisms.

These specimens are labeled as corundum sapphire and ruby. They show a dual range of tones, between red to blue and purple, depending on the incident light and even within the same crystal. They have a very good quality and brilliance that makes them stand out from other of the same species. Crystals, which are doubly terminated, show the hexagonal prism, more or less elongated, and flattened pinacoidal terminal faces, sometimes with echeloned rhombohedral faces. On some faces we can observe geometric striated lines. They are disposed on a matrix of brilliant mica (muscovite) and feldspar.

A rich group of scalenohedral calcite crystals showing parallel growth, with very sharp faces and edges. They are peppered by small crystals of chalcopyrite. They are accompanied by groups of brilliant fluorite crystals, with transparence, bluish tones and cubic forms truncated by the dodecahedron.

On a matrix formed by good size crystals of quartz (var. amethyst) some scalenohedral calcite crystals are disposed, brilliant and translucent. Calcite presents intense red fluorescence under LW-UV light. A very aesthetic piece that represent the calcite crystals which appear in the classic Brazilian amethyst geodes.

An interesting specimen of native copper showing laminar aggregates included within a solid slate matrix. A very different than usual for the species and locality.

Very rich group of azurite crystals, with deep-blue color and very bright. Disposed on the matrix as isolated crystals or in rosettes. Good luster and transparence. Observed under the microscope they show an excellent composition. This specimen is from a classic French mine: Cap Garonne. This mines are well known for the rich paragenesis of rare species. Today it is impossible to collect specimens as closed as mining museum.

They are well known yellow and colorless fluorite specimens from Matagalls (Sant Marçal) mines in the Montseny massif. But less common are these fluorite with blue to green tones (depending on the type of incident light). They show crystals cubic with defined faces and edges, good brilliance and transparence. They are accompanied by small aggregates of hyaline quartz. A historical piece.

Group of grossular, hessonite variety. Good orange to brown color, translucent and defined faces and edges.

Group of grossular, hessonite variety, one of them bigger. Good orange to brown color, translucent and curved faces and edges.

Fragment of a calcite vein that presents a more rich cobaltoan area which gives this pink tone. An old specimen (ca. 1980) that deserves our attention. From a classic Catalan mine.

Excellent aggregate of acicular crystals of this uncommon mineral from a classic mine for the species. The sample dates from the early 1990s and is currently difficult to get pieces with this aesthetic.