Druse of prismatic acicular pyromorphite crystals, transparent, shiny and with the characteristic green color. They are arranged on a quartz matrix. A very aesthetic piece from the Nicolau collection (Barcelona) and with a Joan Viñals label.

140 €

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This specimen, from the Mauldin Mountain quarries, shows an attractive coating of bright-green, botryoidal wavellite on fractured dark gray chert. The wavellite is microcrystalline, making the sparkle in the picture. Very characteristic green colour and good size specimen.

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Group of childrenite crystals, well defined, transparent to translucent, accompanied by aggregates of polythionite (mica group). They are disposed on a matrix with feldspar and quartz.

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In this specimen, obtained in the Manzanera cemetery area, we can observe numerous calcite crystals with quartz, some hematite crystal and, hidden, a yellowish fluorapatite crystal, well defined and transparent. Unique specimen from a very little-known locality.

Drusy crystals of yellow-green (var. cuprian) powellite. Good sized crystals and with rounded faces. Fluoresces bright yellow under SW-UV light. This mine is the Type Locality for szenicsite.

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The specimens of hematite from the Sandra quarry, where dolerites (ophites) are exploited, are known by local collectors, but those extracted in the Manzanera cemetery area have not been as abundant and of high quality. This specimen comes from the Marí-García collection (Castelló) and was collected in 2000. The hematite crystals form isolated "leaves" that are very shiny and iridescent, unlike the quarry. Very aesthetic and unique specimen.

White globular aggregates of thomsonite-Ca, on the basaltic matrix. Excol. M. Marín de Castelló. A classic specimen of Spanish mineralogy.

Groups of intensely colored clinoclase crystals that stand out on the quartz matrix.

This Leonese mine is near the Riaño reservoir. In this specimen we can see various radial aggregates of acicular prismatic stibnite crystals, with an intense luster and disposed in a calcite matrix that include them. In 1909 Spanish Mining Statistics, indicates the demarcation of 22 properties in this area with the name of "María Teresa" mine (document Nr. 3,260), of antimony, in the name of Policarpo Herrero, domiciled in Oviedo (FMF). A very fine and representative specimen.

Very rich druse of pseudomalachite crystals of intense green color, forming defined, translucent prismatic tabular crystals. Specimens of this species in this mine are rare. The piece belonged to the E. Laskowski collection (Tucson, USA), with the seller's label. Very interesting specimen.

The silver specimens from this classic German mine has been known for a long time, but in these specimens silver is included in chrysocolla, of an intense greenish blue colour, and shows a remarkable luster, sometimes with golden iridescence. Under magnification we can see facets of crystals of this metal. We have analyzed these samples and the results indicate that they do not contain other metals detectable by SEM-EDS. These specimens are already a few years old.

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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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Olive green prismatic olivenite crystals are arranged on a goethite matrix, along with dark green cornwallite and light green malachite aggregates. Brazil seems to have a little bit of everything when it comes to deposits, and even though it's best known for it gem pegmatites, there are all sorts of curious localities like Ibiajara where copper minerals (and even a little gold) have been found.

Group of fine prismatic crystals of calcite of hexagonal shape, with colour zoning and small recrystallizations of the same calcite in some areas of the piece. The crystals are on a fluorite matrix with quartz and small pyrite crystals. Both calcite (red-pink) and fluorite fluoresce under UV light.

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Group of fine prismatic crystals of calcite of hexagonal shape, with colour zoning and small recrystallizations of the same calcite in some areas of the piece. The crystals are on a fluorite matrix with quartz and small pyrite crystals. Both calcite (red-pink) and fluorite fluoresce under UV light.

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.

Pineapple cluster of aragonite crystals, with transparence, 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.

Druse of small, bright and defined descloizite crystals. The specimen from the Nicolau collection is accompanied by the handwritten label of Dr. Joan Viñals. It comes from the type locality for calderonite.

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Globular aggregates of white acicular crystals with a silky luster of oyelite, a rare calcium borosilicate, which are accompanied by very brilliant, transparent and well-defined calcite crystals. Nowadays these specimens are quite difficult to be found. It belongs from the Nicolau collection (Barcelona) and it is accompanied by the handwritten label.

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A very rich specimen of lammerite aggregates, green in color, in several geodes we can observe crystals of this rare copper arsenate. It is accompanied by groups of blue lemanskiite crystals (previously identified as lavendulana).