Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century. By 2017, new galleries were opened those located different geodes. These crystals, called "mango quartz" or "crown quartz" were found in them, with inclusions that, after being recently analyzed, were determined as halloysite. The inclusions show filamentous structures and the tips of the crystals turn to orange tones. On our website we have already sold some samples with these inclusions on sale, without the orange coloration. Really aesthetic and on a matrix with goethitized dolomite-siderite.

Brilliant specimen formed by a druse of defined tarpezohedral crystals of grossular, hessonite variety. Intense color, shine and transparence. It is accompanied by groups of green clinochlorine crystals.

Elongated cubic fluorite crystal of very good size, with tile growths on the faces. Between translucent to transparent and with a very uniform violet color. It is complete on both sides and is placed on a small matrix with quartz.

Very interesting specimen of elbaite that has been partially transformed into lepidolite. A Brazilian curiosity. It comes from the Joan Astor collection (Barcelona), with a handwritten and typewritten label.

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Group of hyaline quartz crystals, one of them predominant, with excellent transparence, brilliance and sharpness. They come from this Aragonese locality known for its aesthetic quartz specimens, difficult to see with quality today. It comes from the Joan Astor collection (Barcelona), with a handwritten and typewritten label.

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Very bright corundum crystal, var. ruby, very well defined and pink to brown in color. It comes from the Joan Astor collection (Barcelona), with a handwritten and typewritten label.

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Classic ruby specimen, cherry to pink in color, embedded in a matrix of zoisite and micas. It comes from the Joan Astor collection (Barcelona), with a handwritten and typewritten label.

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Very brilliant pyrohedron cluster, of good size and with well defined faces and edges. With some hematite brilliant lamellar crystals. From this classic Italian locality. It belongs to the Joan Astor collection (Barcelona), with a handwritten and typewritten label.

Very brilliant pyrohedron cluster, of good size and with well defined faces and edges. From this classic Italian locality. It belongs to the Joan Astor collection (Barcelona), with a handwritten and typewritten label.

55 €

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On a microcline-orthoclase-quartz matrix, several laminar aggregates of autunite are disposed, yellow color, transparent to translucent and brilliant. They present, as usual, intense fluorescence under UV light. It belongs to the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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Very aesthetic specimen from this classic Italian mine. Several magnetite crystals with dodecahedron forms, some of them very interestingly distorted crystalography, with intense luster and very well defined. It is accompanied by octahedral pyrite crystals. It comes from the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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The label of this sample indicates that it is a specimen from Reocín. The matrix is a dolomite, different from the usual matrix of Udías hydrozincite specimens, which is usually limonite. In addition, the piece was acquired from Enric Kucera, who is usually quite precise in the labeling. It comes from the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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Andradite var. melanite (Ti-rich) from this well-known skarn deposit. Sharp, lustrous, black and brown dodecahedrons. From the former Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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Druse of fluorapophyllite-(K) crystals covering aggregates of kinoite crystals with an intense blue color. A sample from the past, belonging to the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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Old specimen of a good size formed by a matrix partially covered by small but brilliant crystals of duftite, a lead and copper arsenate, with a deep green color. They are accompanied by prismatic crystals of mimetite, between white and yellowish, together with crystals of cerussite. An entertainment under the magnifying glass. It comes from the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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A brilliant specimen of epidote, brilliant, transparent, richly faceted crystals with a very aesthetic olive green color. With some diopside crystals. The beauty of these specimens is incomparable for the species. It comes from the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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Green aggregates of lindgrenite, forming shiny crusts. Some corroded crystals are observed, associated with bright molybdenite. It belongs to the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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Stalactitic aggregate, pineapple shape, of amethyst quartz crystals. Brilliant and with a more intense "amethyst" color at the tips of the crystals. An aesthetic piece, common, but aesthetic... It belongs to the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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An interesting specimen of turquoise (variety rashleighite) from the Cornwall mines. Formerly, rashleighite was an approved species, now it is defined as a turquoise with a certain iron content, intermediate between chalcosiderite and turquoise. This sample shows a sky blue crust aggregates, with cavities with crystals and a quartz matrix. A Cornish classic from the collection of Joan Astor (Barcelona) and, previously, from Martín Oliete (Madrid), a well-known systematic collector.

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Sulphur specimens from Conil (Cádiz, Andalucía) are highly valued among mineral collectors on the Iberian Peninsula. In this specimen we can see various sulfur aggregates, one of them in the form of a dipyramidal crystal. They are disposed in cavities lined with calcite. The banding of the matrix is perfectly observed. A classic locality for fine crystallized sulfur specimens since 18th century. Probably the area has been worked since Roman times. Very difficult to see in the market. Interesting video of sulphur mines from Conil [video].

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Rich group of hemimorphite crystals forming radial aggregates, with a slightly bluish hue. It is accompanied by black, zoned, tenorite globular aggregates. It belongs to the Joan Astor collection (Barcelona), with a handwritten label and typewritten box.

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Petalite is one of those minerals that today are in the sights of mining companies since it is an aluminum and lithium silicate, lithium is an essential element for the manufacture of batteries. A exfoliated very good size and shiny specimen.

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A very aesthetic miniature formed by various octahedral crystals of fluorite, with a violet to purple color, which contrast on the white quartz matrix. Defined, translucent and with brilliance. The Pine Canyon deposit in New Mexico has been known for more than 20 years and are prized for its fluorite crystals.

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Brilliant aggregate of tabular azurite crystals with this intense and characteristic color. A very aesthetic specimen of this classic Moroccan town. It comes from the Joan Astor collection (Barcelona) who acquired it from Marçal Llòria, from "Lloid-Material de Ciencias Naturales", a well-known Barcelona mineral seller.

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Very rich specimen formed by aggregates of prismatic crystals of mimetite, transparent, forming sheaves and divergent growths. The yellow-orange color and luster make them stand out on a matrix with romobohedral calcite crystals. A classic from the 1960s to 1970s.

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