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Mineral Specimens with Siderite
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12.4 x 8.2 x 3.0 cm. A dramatic and showy cabinet specimen from a small find that was brought out at Munich in 2006. These very unusual, barrel-shaped crystals are actually epimorphs, i.e. casts after calcite crystals, which have been dissolved away. Microprobe analysis in South Africa by Bruce Cairncross and others shows that the shimmering, metallic-like coating is a mixture of siderite and sphalerite. The piece is very light weight for its size and, in fact, the casts are hollow, as the one broken crystal on the right reveals.
MD-228519 - Goethite, Hematite, Siderite, Quartz (Var: Smoky Quartz) - - Archived
R. A. Kosnar claim, Yucca Hill, Steven's Ranch, Lake George, Park Co., Colorado, USA
small cabinet, 7.2 x 3.4 x 2.6 cm.
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7.2 x 3.4 x 2.6 cm. This is a great specimen from one of the most storied and well known districts in Colorado. The pegmatites near the Lake George area of Colorado have produced what most collectors and dealers consider to be the finest Amazonite specimens from the standpoint of superb color, top quality, wonderful display specimens and excellent associations. This particular specimen has no Amazonite, but it is a nice display piece featuring sharp, lustrous, golden-black "needles" of Goethite and metallic grey pseudmorphs of Hematite after Siderite sitting atop a translucent Smoky Quartz crystal. According to Rich Kosnar, Hematite pseudomorphs on Goethite were very rare, and this specimen was the only piece from this claim to show them associated in this manner. This specimen was collected nearly 30 years ago (August of 1980), when Richard Kosnar found some of the finest color Amazonite from Colorado extant. Ex. Richard Kosnar Collection.
4.8 x 3.8 x 3.3 cm. The Lake George area of Colorado is best known for producing some of the most magnificent Amazonite specimens in the world. There aren't many species associated with the Amazonite, mostly Quartz, Albite, Fluorite and sometimes Hematite. The majority of the Hematite specimens from the Lake George area are often found as pseudomorphs after Siderite. This particular specimen features a beautiful cluster of excellent, sharp, aesthetic rhombic crystals of Siderite which have been replaced by Hematite and are sitting atop beautifully contrasting pink Microcline. The largest pseudomorph measures 1.3 cm across, and this is a superb piece of this most classic material. The specimen was collected by Richard Kosnar in the summer of 1978. Ex. Richard Kosnar Collection.
8.8 x 6.2 x 4.3 cm. A sparkling, 3-dimensional specimen with brilliantly lustrous lazulites on sparkling quartz crystals. The lazulites reach 1 cm. The quartz provides the ideal background to display them and this piece overall is so 3-dimensional. Ex. Harold Urish Collection.
16.2 x 7.7 x 3.9 cm. A large cabinet lazulite and siderite specimen from the Rapid Creek area of Canada. The specimen is richly covered with highly lustrous, indigo-blue lazulite crystals to 1.0 cm and is festooned with beautifully accenting, gemmy, golden-amber siderite crystals. The largest siderite, at 7 mm, looks like a jewel. The concentration of large lazulite and siderite crystals in the vuggy area at the top is particularly noteworthy.
3.6 x 1.8 x 1.6 cm. A beautifully gemmy and lustrous, sharply hexagonal, 2.1 cm zoned green apatite crystal perched on matrix of smaller apatites richly covered with siderite rhombs. Classic material from Panasqueira. Ex. Jaime Bird Collection.
4.6 x 2.8 x 2.1 cm. Superb, textbook biotite crystals mark this classic from an old find (1960s if I recall correctly, or maybe the 50s), at the site of the famous hiddenite mines. This crystal is superbly displayed on matrix, a small miniature overall.
11.3 x 8.6 x 5.7 cm. A classic, old-time and fine German cabinet fluorite specimen with an excellent provenance. The glassy, colorless, cuboctahedral fluorite crystals on this 3-dimensional piece have a preferential overgrowth of matte-finish, light rust-red hematite. A few of the crystal faces have an additional, preferential overgrowth of sparkly, golden siderite microcrystals. This historic piece hails from the famous Harz Mountains. Ex. Bement, American Museum and Herb Obodda Collections. Obviously around 100 years old or more.
4.2 x 3.4 x 2.1 cm. A fascinating and striking pseudomorph miniature specimen from a small find that was brought out at Munich in 2006. These very unusual, barrel-shaped crystals are actually epimorphs, i.e. casts after calcite crystals, which have been dissolved away. Microprobe analysis in South Africa by Bruce Cairncross and others shows that the shimmering, metallic-like coating is a mixture of siderite and sphalerite. The piece is very light weight for its size and, in fact, the cast is hollow. Complete all-around and pristine.
11.1 x 6.8 x 7.2 cm. A classic and fine cabinet siderite specimen from the Poudrette Quarry at Mt. St-Hilaire. Two large, lustrous, yellowish-brown siderite rhombs are set on matrix covered with small albite crystals. The large rhomb is 5.5 cm on the diagonal. Both rhombs are complete-all-around. These are large siderite crystals for the locale. Ex. James Zigras Collection.
4.3 x 3.5 x 2.6 cm. An excellent specimen from this old and famous German locality. A sharp and lustrous, 7 mm, cuboctahedral galena crystal is aesthetically set amidst lustrous siderite rhombs, more galena crystals and a couple of gemmy, ruby-jack sphalerite crystals. Easily over 100 years old, as this classic locale closed in 1903. Ex. Mullane Collection.
This English fluorite specimen came with an index card from 1955 indicating that it was obtained in a swap with the American Museum of Natural Histor (David Seaman). The crystals, many of them gemmy, measure to about one centimeter, and show wonderful purple color. Siderite has grown on one side of the specimen, and is interspersed with some of the fluorites on the display face as well. Hey, you can tell people you own something that was in the Smithsonian! 10.4 x 6.2 x 6.0 cm (NOTE: The locality is wrong. Colour and association strongly hint to Weardale)
8.6 x 7 x 3 cm. An exceptional tabular cluster of highly lustrous, well-terminated (some even doubly) bladed Ferberite crystals. The widest of the blades is 4.7 cm across. To make the piece even more extraordinary, there is a very well-developed 1.6 cm Arsenopyrite crystal on the bottom, as well as numerous mm-size Siderite crystals along the back and bottom. There are also five Tetrahedrite (?) crystals (in the second close-up), two singles and one three-crystal cluster, on the Ferberite. Ex. Charlie Key stock.
7.3 x 4.5 x 2.5 cm. A rare locality piece: a plate of gemmy, doubly-terminated Siderite crystals on, along with Chalcopyrite crystals, a blue-grey crust (possibly a Mn Oxide?), all on matrix. These Siderites have excellent symmetry, reminding one of the wheat-sheaf Rhodochrosites from N’Chwaning. The color contrast with the blue-grey crust is outstanding. Ex. Charlie Key stock.
4.0 x 3.3 x 2.2 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 hosts several fine, sharp, highly lustrous, black-brown cyclic twinned crystals of Cassiterite measuring up to 9 mm with Quartz crystals and tan Siderite "discs".
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Rob Lavinsky, rob@irocks.com
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Mineral Specimens by species; or
by specimen id.
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![Siderite from Aggeneys, Northern Cape Province, South Africa [db_pics/mdpics/MD-240559b.jpg]](db_pics/mdpics/MD-240559b.jpg)
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