Cube forms, octahedron and dodecahedron.

Sold

An exceptional specimen composed of several pyrite crystals, one of which stands out for its size, with a very remarkable luster. We observe interesting crystallographic growths that show the cube faces with triglyphic striations and the smooth octahedron faces. It is accompanied by small, lustrous quartz and sphalerite crystals. A very interesting piece from both an aesthetic and crystallographic point of view. The basis of the "Ballon d'Or," awarded annually to the best player in the world, comes from this mine.

130 €

Buy

In this specimen, we can observe several hexagonal pyrrhotite crystals that have been completely replaced by pyrite. The luster is very good, and they stand out in a matrix formed by numerous quartz crystals. A very interesting and aesthetic pseudomorphosis.

Reserved

In this specimen, we can observe several hexagonal pyrrhotite crystals that have been completely replaced by pyrite. The luster is very good, and they stand out in a matrix formed by numerous quartz crystals. With black sphalerite. A very interesting and aesthetic pseudomorphosis.

100 €

Buy

The anatase crystals from this Norwegian locality are a classic of world mineralogy. They are notable for their size. In this specimen, we see a crystal formed by a tetragonal bipyramid truncated at the vertices by pinacoids. Growth contacts and some small chips can be observed, but they do not detract from the quality of the specimen. It is disopsed very aerial on a small quartz matrix.

In this specimen, we can observe numerous rosette-shaped aggregates formed by lenticular rhodochrosite crystals, with a faint pink hue that contrasts with a matrix composed of numerous quartz and calcite crystals, some of them flattened rhombohedrons. It is accompanied by several faceted crystals of brilliant chalcopyrite. A highly aesthetic specimen from this classic Kosovo mine.

Reserved

Aesthetic slab of chalcedony, a translucent cryptocrystalline variety of quartz, with layered growths, blue-gray tones, and botryoidal. It belongs from the Jaime Murria collection (Barcelona).

55 €

Buy

Group of andradite crystals, which show us very well defined faces of the dodecahedron truncated at the edges by those of the trapezohedron. It has an intense brown color and a more marked shine on the trapezohedron faces. Specimen from this classic Russian town that is rare today.

220 €

Buy

The Yinnietharra dravite crystals are a classic of world mineralogy. Nowadays they are not common and can only be obtained from old collections that were lucky enough to be formed when the mines were worked. This specimen shows us a good group of doubly terminated dravite crystals, with very defined faces and edges, shiny and with the characteristic toasted honey color. They are accompanied by muscovite. An AMAZING specimen!!!

290 €

Buy

These specimens from Lục Yên were sold as humite or clinohumite, but later studies have shown that they are chondrodite. Chondrodite is a mineral in the humite group. It is closely related to clinohumite, humite and norbergite, and it is often found with one or more of these minerals. In this specimen the chondrodite shows faces and an orange color that stands out against the marble matrix with small red spinel.

Sold

Recently, specimens of scapolite of Moroccan origin have appeared on the market. The analyses we have carried out on several specimens indicate that it is mainly marialite, since the proportion of Na (marialite, Na₄Al₃Si₉O₂₄Cl) is higher than that of calcium (meionite, Ca₄Al₆Si₆O₂₄CO₃), and the presence of chlorine is also detected. We can see that the proportion of Ca is quite high, so we are in the middle of the marialite-meionite series. Crystals appear as tetragonal prisms truncated by the basal pinacoid and the first-order dipyramid. Transparent to translucent and with some inclusions. Fluorescent under SW-UL. We will send the analyses to the buyer.

Sold

Recently, specimens of scapolite of Moroccan origin have appeared on the market. The analyses we have carried out on several specimens indicate that it is mainly marialite, since the proportion of Na (marialite, Na₄Al₃Si₉O₂₄Cl) is higher than that of calcium (meionite, Ca₄Al₆Si₆O₂₄CO₃), and the presence of chlorine is also detected. We can see that the proportion of Ca is quite high, so we are in the middle of the marialite-meionite series. Crystals appear as tetragonal prisms truncated by the basal pinacoid and the first-order dipyramid. Transparent to translucent and with some inclusions. Fluorescent under SW-UL. We will send the analyses to the buyer.

Sold

Group of pentadodecahedral pyrite crystals on a matrix with small quartz and tennantite crystals. Pyrite shows striated faces and an exceptional luster. In some of the pentadodecahedral pyrite crystals, we can observe edges truncated by the cube faces and some vertices by the octahedron.

190 € 150 €

Buy

These selenite gypsum specimens show the "swallow tail" and reverse twinning. They show a certain transparence, which allows us to see the inclusions, and a good brilliance due to the natural polishing of the gypsum. The most interesting thing, in my opinion, is this rounded appearance due to the erosive action of the sea spray, since they appear in the clays of the Eocene cliffs. A very English curiosity from Jaime Murria's collection.

65 €

Buy

Tamarugite is a rare sodium aluminium sulphate with the formula NaAl(SO₄)₂·6H₂O, which usually appears as white crusts made up of tiny crystals. In this specimen it is accompanied by kröhnkite, another sodium sulphate but this one with copper Na₂Cu(SO₄)₂·2H₂O, in the form of blue-green, translucent elongated crystals. Both rare species!
NOTE: These specimens are natural, formed in a mine, and have nothing to do with those from mine water rafts that were sold years ago at exorbitant prices.

Sold

Tamarugite is a rare sodium aluminium sulphate with the formula NaAl(SO₄)₂·6H₂O, which usually appears as white crusts made up of tiny crystals. In this specimen it is accompanied by kröhnkite, another sodium sulphate but this one with copper Na₂Cu(SO₄)₂·2H₂O, in the form of bluish, transparent and brilliant crystals. Rare species!
NOTE: These specimens are natural, formed in a mine, and have nothing to do with those from mine water rafts that were sold years ago at exorbitant prices.

Sold

A very rich specimen in arsenolamprite, a polymorph of arsenic. As a brilliant vein, grey in colour and with a metallic lustre, formed by lamellar crystals. It is surrounded by very dark grey arsenic. A rare species.

Sold

Acute, yellow to orange, transparent, dipyramidal powellite crystals. Accompanied by molybdenite in the matrix. Very fluorescent under UV short wave, with yellow tones.

Sold

Very good specimen of molybdenite from this locality in Madrid. It appears as well-defined, bright hexagonal crystals with axial growths. It is disposed very aerial on the pegmatitic rock matrix. Very difficult to see and from Joan Viñals col.

Sold

These specimens from Lục Yên were sold as humite or clinohumite, but later studies have shown that they are chondrodite. Chondrodite is a mineral in the humite group. It is closely related to clinohumite, humite and norbergite, and it is often found with one or more of these minerals. In this specimen the chondrodite shows faces and an orange color that stands out against the marble matrix with small red spinel.

Sold

Very aerial topaz crystal on a matrix of quartz and albite. The crystal has well-developed prism faces truncated by the faces of the dipyramids, with excellent transparency, uniform honey color and good luster. It has a small chip on the top back without affecting the quality.

Reserved

This specimen was labelled as Directorio 8 mine, Tocopilla, by Dr. Joan Viñals (1951-2013) but in this mindat locality, clinoatacamite is not referenced. In this specimen we can observe several defined lenticular clinoatacamite green crystals, with transparence and brilliance, accompanied by brilliant gypsum and bluish lavendulan aggregates. Lavendulan is described in Directorio 8 mine.

Sold

Nice speciemen of callaghanite, a rare copper and magnesium carbonate, with a very characteristic cobalt blue colour. It shows a druse formed by numerous crystals. Accompanied by small orange-brown aggregates of pokrovskite, together with globules of hydromagnesite. It is accompanied by the Joan Viñals handwritten label.

Sold

Acute, yellow to orange, transparent, dipyramidal powellite crystals. Accompanied by molybdenite in the matrix. Very fluorescent under UV short wave, with yellow tones.

Sold