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Aggregate of crystals formed by the positive and the negative rhombohedron, twinned, very sharp and transparent. They have grown on a first generation of translucent white rhombohedrons of the same Dolomite. This kind of twin is very uncommon at Eugui, so, historically, they have been very appreciated by collectors.
Asturreta Quarry, Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarre) Spain (±1965)
Specimen size: 14.5 × 11.4 × 8.7 cm = 5.71” × 4.49” × 3.43”

HM780EM: Dolomite (twinned)

Group of very sharp rhombohedral Dolomite crystals, transparent, with good luster, a slightly gray color and on matrix. An excellent Spanish classic.
Asturreta Quarry, 'el pozo', Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarre) Spain (±1970)
Specimen size: 14.5 × 11.8 × 6.8 cm = 5.71” × 4.65” × 2.68”

Main crystal size: 5.5 × 3 cm = 2.17” × 1.18”

TD97D8: Dolomite (twinned)

From the John Barlow collection, this perfect twin of two Dolomite crystals shows the degree of transparency and brilliance that has made the Dolomite from Eugui so famous. A very esthetic floater.
Asturreta Quarry, Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarre) Spain (±1974)
Specimen size: 5.5 × 4.9 × 4.2 cm = 2.17” × 1.93” × 1.65”

TC2540MFM: Dolomite (variety Co-bearing dolomite)

Rhombohedral crystals of Dolomite (cobalt-bearing variety), on matrix, with very well defined faces and edges, translucent, with good luster and intense and vivid shades of mauve.
Kansalawile Mine, Tenke-Fungurume area, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba) Democratic Republic of the Congo (Zaire)
Specimen size: 7.3 × 5.3 × 3.5 cm = 2.87” × 2.09” × 1.38”

Main crystal size: 1 × 0.8 cm = 0.39” × 0.31”

TC2440MGG: Dolomite (variety Co-bearing dolomite) with Malachite

Rhombohedral crystals of Dolomite (cobalt-bearing variety), on matrix, with very well defined faces and edges, translucent, with good luster and shades of an intense and vivid mauve color, with green Malachite concretions.
The specimen has been photographed and published in the magazine ‘Paragénesis’, number 01/2022, page 74
Kansalawile Mine, Tenke-Fungurume area, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba) Democratic Republic of the Congo (Zaire)
Specimen size: 7.3 × 4.1 × 3.9 cm = 2.87” × 1.61” × 1.54”

ERX47AQ1: Dolomite (variety cobalt-bearing dolomite)

Sharp rhombohedral crystals of Dolomite (Co-bearing variety) with an intense color and on a partially metallic matrix, probably Skutterudite.
Bou Azzer Mines, Bou Azzer mining district, Ouarzazate Province, Drâa-Tafilalet Region Morocco
Specimen size: 5.6 × 4.2 × 2.8 cm = 2.20” × 1.65” × 1.10”

Main crystal size: 0.4 × 0.3 cm = 0.16” × 0.12”

ET87AL7: Dolomite (variety cobaltoan) with Heterogenite

Druse of rhombohedral Dolomite crystals with the so-called “saddle” habit and different shades of mauve, intense and lively and with Heterogenite coatings.
Mashamba West Mine, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba) Democratic Republic of the Congo (Zaire)
Specimen size: 10.6 × 6.2 × 2.2 cm = 4.17” × 2.44” × 0.87”

JFD36AN7: Dolomite (variety Fe-bearing dolomite) with Calcite

I had seen many pieces from this locality, but never found one that completely satisfied me. In 2013, Ester Pulido from 'Tesoros Naturales' had this piece and, given how 'fresh' the Fe-bearing Dolomite looked, and the beautiful edging of the white Calcite, I really liked it and bought it from her. In fact I still think that it is very beautiful for what is usually seen in this locality.
Iron mines of Ojos Negros, Ojos Negros, Comarca Jiloca, Teruel, Aragon Spain
Specimen size: 11.6 × 9.4 × 5 cm = 4.57” × 3.70” × 1.97”

Main crystal size: 2.7 × 2.2 cm = 1.06” × 0.87”

JFD224AP8: Dolomite (variety Fe-bearing dolomite) with Pyrite

Lots of history in this piece. It came from the Folch collection (duplicates) labeled as “Ankerite”, a name commonly ascribed in the past to more or less iron-bearing dolomites, since it was difficult then to analyze them adequately. At one time I sold it to Francesco S. Stoppani and it resided in his collection until Francesco decided to sell it, and on repurchasing it I decided to repatriate it because I had always liked it a lot and it had seemed quite unique to me. Its only drawback is that we cannot know with certainty in which mine it was found, because Folch just labeled it “La Unión”, and the experts in that mining district who have seen the specimen cannot say for sure exactly which mine it came from. Typical classic piece, with a lot of history behind it and prettier than usual.
La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia) Spain
Specimen size: 11.8 × 9.2 × 4.8 cm = 4.65” × 3.62” × 1.89”

ST56AC0: Dolomite after Calcite and Hematite

Aggregate of scalenohedral Calcite crystals, on matrix, with red Hematite inclusions. The Calcite crystals have internally dissolved leaving only remaining the former crystal form. Both the matrix surface and the cavities on it, including the interior of the Calcite crystals, are coated by small Dolomite rhombohedrons. As is the case with so many specimens in this collection, the sample is of great quality for the locality.
Christiane Mine, Adorf, Diemelsee, Waldeck-Frankenberg District, Hesse/Hessen Germany (±1950)
Specimen size: 9.2 × 5.4 × 4.8 cm = 3.62” × 2.13” × 1.89”

Main crystal size: 2.7 × 1.5 cm = 1.06” × 0.59”

SB37AE3: Dolomite after Calcite and with Pyrite

Aggregate of small rhombohedral Dolomite crystals pseudomorphous after large scalenohedral Calcite crystals on a matrix with very sharp and bright cubic Pyrite crystals. An Italian classic.
The sample is with a label from the Stoppani collection that we’ll send to the buyer. As is the case with so many specimens in this collection, the sample is of great quality for the locality
Niccioleta Mine, Massa Marittima, Grosseto Province, Tuscany Italy
Specimen size: 13.5 × 8.2 × 7 cm = 5.31” × 3.23” × 2.76”

SD99AC3: Dolomite on Quartz and Chalcopyrite

Slightly deformed rhombohedral Dolomite crystals with a pale-brown to pinkish color, with small twinned Chalcopyrite crystals on their surfaces and on a base of Quartz crystals with a very poorly developed prism. It is an excellent German classic for the species and the locality. As is the case with so many specimens in this collection, the sample is of great quality for the locality.
Eupel Mine, Niederhövels, Wissen, Flammersfeld, Altenkirchen (Westerwald), Siegerland, Rhineland-Palatinate/Rheinland-Pfalz Germany
Specimen size: 17.8 × 10.2 × 4.4 cm = 7.01” × 4.02” × 1.73”

Main crystal size: 1.2 × 1.1 cm = 0.47” × 0.43”

HM220NF: Dolomite on Quartz with Siderite and Ferberite

Group of white rhombohedral Dolomite crystals with very well defined faces and edges, on matrix, with small crystals of Quartz, Ferberite, and lenticular crystals of Siderite.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Portugal (±2000)
Specimen size: 10.8 × 7.6 × 6.6 cm = 4.25” × 2.99” × 2.60”

SD96AF0: Dolomite with Calcite

Groups, on a rocky matrix, of very Sharp rhombohedral crystals with polycrystalline growths, bright and with a snowy white color.
The sample is from the Francesco S. Stoppani collection (catalog number 0948), whose label we’ll send to the buyer.
Val Pulita Quarry, Valpulita, Carrara, Apuan Alps, Massa-Carrara Province, Tuscany Italy
Specimen size: 8.2 × 7.4 × 6.5 cm = 3.23” × 2.91” × 2.56”

Main crystal size: 2.6 × 2.2 cm = 1.02” × 0.87”

EE87AL4: Dolomite with Calcite

Floater group of white rhombohedral Dolomite crystals that form parallel polycrystalline aggregates and are partially coated with some Calcite crystals.
Stan Trg (Stan Terg, Stari Trg) Mine, Trepča Complex, Trepča Valley, Kosovska Mitrovica, Kosovska Mitrovica District Kosovo (2002)
Specimen size: 14.3 × 8.9 × 4.4 cm = 5.63” × 3.50” × 1.73”

EJ89AG8: Dolomite with Calcite, Pyrite, Arsenopyrite and Quartz

The great mining region of Trepča is one of the largest polymetal deposits in the world and it has given for many years exceptional pieces of Sphalerite as well as varied combinations of sulfides and carbonates. This old piece, found before the mine went back to work in 2005, presents an architectural group of large rhombohedral Dolomite crystals partially coated by Calcite crystals and with a cluster of Pyrite crystals on one side of the piece. Small crystals of Arsenopyrite dot the large Dolomite crystals and also some small Quartz crystals complete the combo.
Stan Trg (Stan Terg, Stari Trg) Mine, Trepča Complex, Trepča Valley, Kosovska Mitrovica, Kosovska Mitrovica District Kosovo (1994-2002)
Specimen size: 18.5 × 11.5 × 7.7 cm = 7.28” × 4.53” × 3.03”

Main crystal size: 4 × 3.3 cm = 1.57” × 1.30”

SC7AD6: Dolomite with Chalcopyrite and Quartz

Very sharp white rhombohedral Dolomite crystals implanted on a matrix of Quartz crystals with small twinned Chalcopyrite crystals on both the Quartz and the Dolomite. An excellent German classic.
Eupel Mine, Niederhövels, Wissen, Flammersfeld, Altenkirchen (Westerwald), Siegerland, Rhineland-Palatinate/Rheinland-Pfalz Germany
Specimen size: 16.8 × 10.5 × 6.5 cm = 6.61” × 4.13” × 2.56”

TP36J8: Dolomite with doubly terminated Quartz

Thick tabular crystal tabular formed by dominant pinacoid faces and those of the rhombohedron, giving it a hexagonal shape. The frosted crystal is implanted on a neat and bright, doubly terminated, prism of Quartz.
Serra das Éguas, Brumado, Bahia, Northeast Region Brazil (2006)
Specimen size: 9.3 × 2.8 × 2.7 cm = 3.66” × 1.10” × 1.06”

Main crystal size: 2.1 × 2.1 cm = 0.83” × 0.83”

SE96AB8: Dolomite with Hematite (kidney ore)

Aggregates of saddle-shaped Dolomite crystals on a matrix of botryoidal Hematite coated by a thin layer of very small lenticular crystals of the same Hematite.
The sample is with labels from the J.F. Lanoë collection and the Stoppani collection. As is the case with so many specimens in this collection, the sample is of great quality for the locality.
Beckermet Mine, Egremont, West Cumberland Iron Field, former Cumberland, Cumbria England / United Kingdom
Specimen size: 11.7 × 7 × 2 cm = 4.61” × 2.76” × 0.79”

MV10W4: Dolomite with Hemimorphite

Very well defined rhombohedral crystals of simple forms, bright and with snowy white color. They are implanted on a base of flattened crystals of Hemimorphite, also very well defined, and on a limonite matrix. Such samples were quite common at the Ojuela Mine in the eighties.
Ojuela Mine, Mapimí, Municipio Mapimí, Durango Mexico (1970-1980)
Specimen size: 8.2 × 6.1 × 4.1 cm = 3.23” × 2.40” × 1.61”

Main crystal size: 2.7 × 2.1 cm = 1.06” × 0.83”

JEM96AP8: Dolomite with Magnesite

Rhombohedral Dolomite crystals, transparent, very lustrous, colorless and on matrix, with lenticular Magnesite crystals. This specimen has a very different crystallography than usual, and comes from the collection of Andrés Jiménez Shelly and was previously in the Folch collection (duplicates) whose handwritten label we will attach.
Asturreta Quarry, Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarre) Spain (±1970)
Specimen size: 6.3 × 4.9 × 3.3 cm = 2.48” × 1.93” × 1.30”

NC11G8: Dolomite with Magnesite

Group of rhombohedral crystals. They are twinned and have very well marked triangular growth figures. On the matrix there are little lenticular crystals of Magnesite. Different from the usual.
Azcárate Quarry, Eugui, Esteríbar, Comarca Auñamendi, Chartered Community of Navarre (Navarre) Spain (09/2005)
Specimen size: 6.2 × 4.3 × 3.8 cm = 2.44” × 1.69” × 1.50”

NC36C3: Dolomite with Mica

Something very different for the common stuff from this mine. Very brilliant and a little bit transparent groups of parallel crystals of very white Dolomite. The quality is much better than the others and the form is totally different from the regular ones from this mine.
Minas da Panasqueira, level 3, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Portugal (2002)
Specimen size: 10 × 5 × 5.5 cm = 3.94” × 1.97” × 2.17”

HM110EV: Dolomite with Quartz

White rhombohedral Dolomite crystals on matrix, among which a clearly dominant group stands out in the upper part of the specimen. An Italian alpine classic.
Traversella Mine, Traversella, Chiusella Valley, Canavese District, Metropolitan City of Turin Province, Piedmont (Piemonte) Italy
Specimen size: 12.2 × 7.3 × 3.3 cm = 4.80” × 2.87” × 1.30”

Main crystal size: 3 × 2.5 cm = 1.18” × 0.98”

MTR47CD4: Dolomite with Quartz and Epidote

Dolomite crystals, two of them clearly dominant and with very marked rhombohedral forms, rough faces and sharp edges, partially covered by small lustrous, silky-looking Calcite crystals and groups of water-clear doubly terminated Quartz crystals forming parallel groups, and with small crystals of intense green Epidote at the base of the specimen. Very unusual for the locality.
Iouriren Mine (AGM Mine), Akka, Tafraout, Tiznit Province, Souss-Massa Region Morocco
Specimen size: 10.1 × 7.3 × 5.7 cm = 3.98” × 2.87” × 2.24”

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