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JFD15AN5: Siderite with Pyrite (octahedral)
Curious and original, I always liked it, and although in Tucson I sold it to Jim Robison, but oh what turns life takes, it came back to me, since when Rob Lavinsky bought Jim's collection he sold this piece to the Belgian collector Wouter Van Tichelen who one day offered it to me, so I bought it from him and it came back to home! (until when? 😉)
Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (1980)
Specimen size: 9 × 8.3 × 5.7 cm = 3.54” × 3.27” × 2.24”
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NP86AB8: Siderite with Pyrite and Muscovite
Elongated Siderite crystal with very well defined growth striations and good terminations, the lower one bordered by small cubic pyrite crystals. It is on a matrix of leafy Muscovite with Pyrite crystals.
Minas da Panasqueira, level 0, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (11/2014)
Specimen size: 6.3 × 4.9 × 2.3 cm = 2.48” × 1.93” × 0.91”

Main crystal size: 4.4 × 3 cm = 1.73” × 1.18”
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NBE26AN4: Siderite with Pyrite and Quartz
Aerial group of Siderite crystals with a lenticular habit, very sharp crystal forms, a silky luster and a light brown color. They are partially covered by small cubic Pyrite crystals and are on a matrix of Quartz crystals.
Minas da Panasqueira, level 3, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (1998)
Specimen size: 9.6 × 6.4 × 3.2 cm = 3.78” × 2.52” × 1.26”
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TR49AJ5: Siderite with Pyrite, Quartz and Muscovite
Great group of Siderite crystals with the predominant forms of the short prism and a flattened rhombohedron. They have a brown color and are partially coated by small Pyrite crystals and are on matrix with crystals of Quartz, leafy Muscovite aggregates, Arsenopyrite and cubic Pyrite.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal
Specimen size: 12.3 × 11.6 × 8.5 cm = 4.84” × 4.57” × 3.35”

Main crystal size: 7 × 4.3 cm = 2.76” × 1.69”
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GQ11R6: Siderite with Pyrrhotite
The sample is very representative of the Siderite from the Morro Velho gold mine, samples that were relatively abundant a few decades ago and very scarce today. The lenticular crystals, very sharp, have an excellent color and intense luster.
Morro Velho Mine, Nova Lima, Belo Horizonte, Minas Gerais  Brazil
Specimen size: 5 × 4.8 × 3.8 cm = 1.97” × 1.89” × 1.50”
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TQ13AG0: Siderite with Quartz
Spheroidal aggregates of small lenticular Siderite crystals on a group of Quartz crystals
San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain (1980-1985)
Specimen size: 4.9 × 4.4 × 4.4 cm = 1.93” × 1.73” × 1.73”

Main crystal size: 1.3 × 1.2 cm = 0.51” × 0.47”
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DT26AH6: Siderite with Quartz
Thick tabular Siderite crystals with pinacoidal terminations and flattened rhombohedral faces. They have a clear cream color and are with Quartz crystals with inclusions of Muscovite microcrystals.
The sample is, very probably, one of the latest to be incorporated in the Daunis collection by Daunis’ wife Maria. We’ll send to the buyer a commercial label that is with the sample.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal
Specimen size: 6.6 × 5.3 × 4.2 cm = 2.60” × 2.09” × 1.65”
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MY76AL3: Siderite with Quartz
Group of very flattened rhombohedral Siderite crystals with a lenticular habit, with polycrystalline surfaces on the faces. On matrix, with hyaline Quartz crystals. Its color is different from the usual in specimens from this area.
Le Collet d'Allevard, Allevard, Haut-Grésivaudan, Grenoble, Isère, Auvergne-Rhône-Alpes  France
Specimen size: 8.9 × 6.3 × 3.1 cm = 3.50” × 2.48” × 1.22”

Main crystal size: 2.5 × 1.8 cm = 0.98” × 0.71”
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TR86AF7: Siderite with Quartz
Partial coatings of lenticular Siderite crystals that are very bright and have grown on Quartz crystals that have a very short prism.
The sample is from the collection of La Unión area minerals of Alain Martaud, whose label we’ll send to the buyer.
San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain
Specimen size: 10.1 × 5.3 × 6.7 cm = 3.98” × 2.09” × 2.64”
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NW27AM8: Siderite with Quartz
Group of transparent Quartz crystals partially covered by tabular Siderite crystals, with a light cream color and high quality.
Minas da Panasqueira, level 3, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (1999)
Specimen size: 10.5 × 6.8 × 4.6 cm = 4.13” × 2.68” × 1.81”

Main crystal size: 10.5 × 3.4 cm = 4.13” × 1.34”
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EY47AG7: Siderite with Quartz
Elongated and floater rhombohedral Siderite crystal. It is translucent, bright and partially coated by small clear Quartz crystals.
The sample, very typical of its classic French locality, is from the Christophe Marot collection (cat. nr. C7-2), whose label we’ll send to the buyer.
Saint-Pierre-de-Mésage, Vizille, Grenoble, Isère, Auvergne-Rhône-Alpes  France
Specimen size: 5.2 × 4.3 × 2.2 cm = 2.05” × 1.69” × 0.87”
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ETB87AO0: Siderite with Quartz
Lenticular and very flattened crystals of Siderite, with the typical curvatures and undulations seen in specimens from this deposit, with good luster and a very light and uniform brown color. On matrix, with Quartz crystals. An excellent French classic.
La Mure coal mines, La Mure, Matheysine-Trièves, Grenoble, Isère, Auvergne-Rhône-Alpes  France
Specimen size: 12.4 × 6.1 × 2.5 cm = 4.88” × 2.40” × 0.98”

Main crystal size: 1.7 × 1.2 cm = 0.67” × 0.47”
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SR58AC7: Siderite with Quartz
Aggregate of very sharp and well defined rhombohedral crystals with echeloned edges. They are very bright, have a clear brown color and are on matrix, with very well defined Quartz crystals. As is the case with so many specimens in this collection, in this case a German classic, the sample is of great quality for the locality.
Neudorf, Harzgerode mining district, Harz, Saxony-Anhalt/Sachsen-Anhalt  Germany
Specimen size: 11.2 × 8 × 4.8 cm = 4.41” × 3.15” × 1.89”
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NB89AL3: Siderite with Quartz
Powerful group of Quartz crystals displaying a dipyramidal habit, as the prism is mostly absent, covered by an epigenetic growth of small Siderite crystals. The size of the Quartz crystals and the quality of the piece is much higher than what is usually found in this deposit.
The specimen comes from the Miguel David Martínez collection, whose label we will send to the buyer along with a small poster that certifies that this specimen was displayed in the “Minerals of the Mediterranian 2014” exhibition at the 2014 Expominer Show.
San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain (±1990)
Specimen size: 14.7 × 9.3 × 5.5 cm = 5.79” × 3.66” × 2.17”

Main crystal size: 3.5 × 3.1 cm = 1.38” × 1.22”
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LM94AK4: Siderite with Quartz
Group of flattened lenticular crystals of Siderite, translucent, bright and of uniform brown color, on matrix, with small water-clear crystals of Quartz. An excellent French classic from the Philippe Morelon collection (No. 362), whose label we will send to the buyer.
La Mure coal mines, La Mure, Matheysine-Trièves, Grenoble, Isère, Auvergne-Rhône-Alpes  France (±1994)
Specimen size: 18.4 × 7.2 × 4.4 cm = 7.24” × 2.83” × 1.73”
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EF86R3: Siderite with Quartz
Aggregate of very sharp simple and transparent rhombohedral crystals with a rich color, very bright for the species. Selectively coated by groups of clear crystals of Quartz. A nice classic.
Allevard, Haut-Grésivaudan, Grenoble, Isère, Auvergne-Rhône-Alpes  France
Specimen size: 5.2 × 3.7 × 3.8 cm = 2.05” × 1.46” × 1.50”

Main crystal size: 1.8 × 1.5 cm = 0.71” × 0.59”
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N7CK0: Siderite with Quartz
Crystal of tabular habit partially covered by small Pyrite crystals. The base is a group of Quartz crystals.
Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (1997)
Specimen size: 5.8 × 5.1 × 6.2 cm = 2.28” × 2.01” × 2.44”
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RD60M0: Siderite with Quartz
Lenticular Siderite crystals with a marked color zoning darker in the center and light-colored towards the edges. On a Quartz matrix.
Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal
Specimen size: 4.9 × 4.2 × 2.4 cm = 1.93” × 1.65” × 0.94”

Main crystal size: 0.8 × 0.4 cm = 0.31” × 0.16”
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N14CK9: Siderite with Quartz
Barrel-shaped crystals of Siderite on a group of Quartz crystals and small crystals of Arsenopyrite and Pyrite.
Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (1997)
Specimen size: 7.2 × 6.4 × 5.2 cm = 2.83” × 2.52” × 2.05”
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NC64G8: Siderite with Quartz
An encrustation of little crystals of Siderite covers the rhombohedral terminal faces of a Quartz prism. Two of the crystals have a big size enhancing from the group.
Minas da Panasqueira, level 3, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (2004)
Specimen size: 11.1 × 6.2 × 5 cm = 4.37” × 2.44” × 1.97”
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ST37AB6: Siderite with Quartz
Aggregates of thick lenticular crystals with very well defined faces and edges, bright with a very deep brown color and on matrix, with thin white Quartz veins. An excellent English classic. As is the case with so many specimens in this collection, the sample is of great quality for the locality.
Tincroft Mine, Carn Brea and Tincroft United Mines, Carn Brea, Camborne - Redruth - Saint Day District, Cornwall  England / United Kingdom
Specimen size: 7 × 4.8 × 5 cm = 2.76” × 1.89” × 1.97”
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TP26AI7: Siderite with Quartz (variety amethyst)
Coatings of rhombohedral Siderite microcrystals that are very bright and have a deep yellowish color with golden reflections. They are are on a group of Quartz (amethyst variety) crystals with a very pale color. The sample is from the collection of La Unión area minerals of Alain Martaud whose label we’ll send to the buyer.
San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia)  Spain (1980-1985)
Specimen size: 6.1 × 5.1 × 3 cm = 2.40” × 2.01” × 1.18”
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NY13AB1: Siderite with Quartz and Arsenopyrite
Aggregate of prismatic Siderite crystals with pinacoidal terminations. They have a very uniform dark brown color and silky luster due to microcrystalline surfaces on the prisms. The Siderite is with a small matrix of Quartz and Arsenopyrite and has cubic Pyrite microcrystals on its faces. Unlike most Panasqueira Siderite, this sample lacks the typically dull creamy second generation, which makes it very showy.
Minas da Panasqueira, level 0, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (11/2014)
Specimen size: 4.3 × 3.3 × 2 cm = 1.69” × 1.30” × 0.79”
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NM16F4: Siderite with Quartz and Arsenopyrite
The Siderite has formed an intensely colored, rose-like spray of crystals, which cover the Quartz. On these lenticular crystals there are some crystals of Arsenopyrite.
Minas da Panasqueira, level 3, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro  Portugal (2004)
Specimen size: 10.7 × 7 × 8.5 cm = 4.21” × 2.76” × 3.35”
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ED89Y9: Siderite with Quartz and Baryte
Aggregates of very flattened lenticular Siderite crystals on a matrix of Quartz crystals with very sharp white rhombohedral Calcite crystals and a Baryte crystal with very well defined faces and edges, a very rare species at Le Mure.
La Mure coal mines, La Mure, Matheysine-Trièves, Grenoble, Isère, Auvergne-Rhône-Alpes  France
Specimen size: 12.7 × 12.5 × 4 cm = 5.00” × 4.92” × 1.57”

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The Desmond Sacco
Collection		 Best Specimens
Best Specimens		 The Folch Collection
The Folch
Collection		 Home Page Minerals
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