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Mineral Specimens with Siderite
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7.6 x 5.2 x 1.5 cm. Bolivia has probably produced more tin than any other country in the world. The great tin mines at Viloco (sometimes called Araca) have produced some of the most magnificent Cassiterite specimens extant. This particular specimen consists of several fine, sharp, highly lustrous, cyclic twinned crystals measuring up to 1.5 cm with light tan colored Siderite "discs".
11.1 x 5.4 x 5.2 cm. An old-time specimen from Bisbee. Siderite can be rather ugly, but here, it has a botryoidal form that is a shimmering, sparkling chocolate brown across most of its surface. These were classics, found just in a short period in the 1960s. Ex. Mullane Collection.
14.5 x 10.5 x 7.8 cm. A superb, cabinet-sized specimen of lustrous, golden-brown, zinc-rich, siderite disks festooned on all sides on a shoe-shaped matrix. The backside of the piece is strikingly cavernous. Siderite is a common gangue mineral at the Tsumeb Mine, but seldom in this size and quality. Ex. Rob Smith Collection.
7.1 x 5.7 x 4.7 cm. A classic and fine combination piece of species, for which the Panasqueira Mine is renowned. Lustrous, jet-black clusters of ferberite blades are set on a jackstraw matrix of two, large siderite crystals. The 7.0 cm, water-clear quartz crystal and the contacted quartz shard on the siderite edge are fine accents. Ex. Gene Meieran Collection.
7.0 x 4.8 x 4.0 cm. A superb and classic apatite specimen from Panasqueira, Portugal and the Smithsonian and Dr. Gary Hansen Collections. This two-sided beauty is composed of very glassy and well-striated, green apatite crystals beautifully accented with sparkly, golden chalcopyrite on the edges. A surprise on the back features more chalcopyrite on tiny siderite crystals. This is a superb, near floater specimen.
2.3 x 2.1 x 1.5 cm. Rapid Creek is known for the best lazulites in the world. They have a very deep teal color and glassy luster, and are often, as here, associated with gemmy rhombs of deep amber-colored siderite and crystals of quartz. An aesthetic and well-balanced thumbnail of this combination.
A remarkable cluster of upright, steeply tapered crystals perched against microcrystalline siderite on rock matrix. While there is some contacting to the right-rear surfaces of the cluster, the actual front faces and terminations are in good shape. 2.5 x 2 x 1.3 cm
8.4 x 7.9 x 5.7 cm. From a small find that was brought out at Munich in 2006, these are very unusual crystals in that they are hollow casts after calcite, and the coating is a mixture of sphalerite and siderite. They have been extensively analyzed in South Africa, to come up with this conclusion, by Bruce Cairncross and others. So far as I am aware, this is a first. This has good 3-dimensional form, a good surface shimmer (almost metallic), and no damage except to the periphery where you can see into the hollow casts. Ex. Charlie Key.
6.0 x 4.7 x 2.5 cm. A rich and fine, two-sided specimen covered with highly lustrous, indigo-blue lazulite crystals to 1.0 cm. This fine piece is beautifully accented with gemmy, golden-amber siderite crystals. One side is richer in smaller lazulite and siderite crystals. The other side has the larger lazulite crystals. This is excellent quality combination material from the Rapid Creek locality in Canada. All of the primary lazulite crystals are pristine.
8.8 x 5.1 x 2.4 cm. A classic, superb specimen of highly lustrous and translucent, shimmering tan-colored siderite rhombs (flattened so they look like discs) in an arborescent cluster. These specimens, of a very characteristic style and habit, were found in the 1960s at this famous gold mine. The edges are festooned with small brassy, tabular crystals of both cubanite (more erratically formed or acicular crystals) and pyrrhotite (sharply hexagonal). The larger hexagonal crystal of pyrrhotite (about 1 cm).
VERY flashy example of this classic combination, featuring sharp siderite crystals perched in lustrous, complexly crystallized galena. Ex. Bement collection with both originalturn-of-the-1900s label and matching arrow/cat# painted on the bottom of the specimen. 9.2 x 7.6 x 5.8 cm
8.8 x 6.8 x 4.8 cm. Siderite from South Korea is rare available. This showy and excellent, mounded piece features a multitude of lustrous, grayish siderite discs in interesting patterns with a preferential overcoat on reddish-brown iron oxides. Very highly representative of this uncommon material. Older material and accompanied by a faded label. Ex. Mullane Collection.
SHARP and large rhombohedral crystals to 4 cm in size, with muscovite, make this piece one of the finest North American siderite specimens to my mind. It is from last year's mining at thee famous gem locations. 6.4 x 5.1 x 4.2 cm
16.9 x 11.8 x 6.0 cm. A superb, large cabinet plate richly and aesthetically covered with lustrous, battleship-gray, cuboctahedral galena crystals to 3.0 cm. The galena crystals are uniquely accented by a preferential coating of sparkly, tan siderite microcrystals, which gives each galena crystal an unusual segmented look. The 3-dimensional, quartz and sulfide matrix is further complimented by more siderite and a rich peppering of tiny, sparkly sphalerite and galena crystals.
4.4 x 3.5 x 2.2 cm. A beautiful and classic cluster of lustrous, very glassy, stepped-growth face, yellow-green siderite blades from the 1960s find at the Morro Velho Mine, Nova Lima, Brazil. Textbook and excellent material from this renowned locale. Ex. Jaime Bird Collection.
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Rob Lavinsky, rob@irocks.com
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share specimen![Cassiterite, Siderite from Viloco Mine (Araca mine), Loayza Province, La Paz Department, Bolivia [db_pics/mdpics/MD-210560a.jpg]](db_pics/mdpics/MD-210560a.jpg)
![Cassiterite, Siderite from Viloco Mine (Araca mine), Loayza Province, La Paz Department, Bolivia [db_pics/mdpics/MD-210560b.jpg]](db_pics/mdpics/MD-210560b.jpg)
![Siderite from Calumet and Arizona Mine (Junction Mine; Junction shaft), Calumet and Arizona group of claims (Calumet and Arizona Mining Company group of claims), Bisbee, Warren District, Mule Mt [db_pics/mdpics/MD-210744a.jpg]](db_pics/mdpics/MD-210744a.jpg)
![Siderite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-211556a.jpg]](db_pics/mdpics/MD-211556a.jpg)
![Siderite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-211556b.jpg]](db_pics/mdpics/MD-211556b.jpg)
![Ferberite, Quartz, Siderite from Panasqueira, Covilhã, Castelo Branco District, Portugal [db_pics/mdpics/MD-213071a.jpg]](db_pics/mdpics/MD-213071a.jpg)
![Ferberite, Quartz, Siderite from Panasqueira, Covilhã, Castelo Branco District, Portugal [db_pics/mdpics/MD-213071b.jpg]](db_pics/mdpics/MD-213071b.jpg)
![Apatite-(CaF), Chalcopyrite, Siderite from Panasqueira, Covilhã, Castelo Branco District, Portugal [db_pics/mdpics/MD-213090a.jpg]](db_pics/mdpics/MD-213090a.jpg)
![Apatite-(CaF), Chalcopyrite, Siderite from Panasqueira, Covilhã, Castelo Branco District, Portugal [db_pics/mdpics/MD-213090b.jpg]](db_pics/mdpics/MD-213090b.jpg)
![Lazulite, Siderite from Rapid Creek, Dawson Mining District, Yukon Territory, Canada [db_pics/mdpics/MD-213149a.jpg]](db_pics/mdpics/MD-213149a.jpg)
![Phosphophyllite, Siderite from Unificada Mine, Cerro de Potosí (Cerro Rico), Potosí City, Potosí Department, Bolivia [db_pics/mdpics/MD-21359a.jpg]](db_pics/mdpics/MD-21359a.jpg)
![Siderite, Sphalerite from Aggeneys, Northern Cape Province, South Africa [db_pics/mdpics/MD-215482a.jpg]](db_pics/mdpics/MD-215482a.jpg)
![Lazulite, Siderite from Rapid Creek, Dawson Mining District, Yukon Territory, Canada [db_pics/mdpics/MD-222324a.jpg]](db_pics/mdpics/MD-222324a.jpg)
![Lazulite, Siderite from Rapid Creek, Dawson Mining District, Yukon Territory, Canada [db_pics/mdpics/MD-222324b.jpg]](db_pics/mdpics/MD-222324b.jpg)
![Siderite, Pyrrhotite, Cubanite from Morro Velho mine (incl. Mina Velha; Mina Grande), Nova Lima, Iron Quadrangle, Minas Gerais, Southeast Region, Brazil [db_pics/mdpics/MD-224106a.jpg]](db_pics/mdpics/MD-224106a.jpg)
![Siderite, Pyrrhotite, Cubanite from Morro Velho mine (incl. Mina Velha; Mina Grande), Nova Lima, Iron Quadrangle, Minas Gerais, Southeast Region, Brazil [db_pics/mdpics/MD-224106b.jpg]](db_pics/mdpics/MD-224106b.jpg)
![Siderite, Galena from Neudorf, Harzgerode, Harz Mts, Saxony-Anhalt, Germany [db_pics/mdpics/MD-22503a.jpg]](db_pics/mdpics/MD-22503a.jpg)
![Siderite from Ulsan Mine, Ulsan, South Korea [db_pics/mdpics/MD-225039a.jpg]](db_pics/mdpics/MD-225039a.jpg)
![Siderite from Emerald Valley Mine, Hiddenite, Alexander Co., North Carolina, USA [db_pics/mdpics/MD-22534a.jpg]](db_pics/mdpics/MD-22534a.jpg)
![Galena, Siderite, Sphalerite from Madan ore field, Rhodope Mts, Smolyan Oblast, Bulgaria [db_pics/mdpics/MD-226406a.jpg]](db_pics/mdpics/MD-226406a.jpg)
![Siderite from Morro Velho mine (incl. Mina Velha; Mina Grande), Nova Lima, Iron Quadrangle, Minas Gerais, Southeast Region, Brazil [db_pics/mdpics/MD-227560a.jpg]](db_pics/mdpics/MD-227560a.jpg)