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Mineral Specimens with Siderite
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A SUPERB and highly lustrous, columnar black ferberite specimen from Portugal. The terraces, sides and top of the specimen are capped by tiny, lustrous tan siderite discs, which add pizzazz to this fine piece. Arsenopyrite crystals, more siderite crystals and calcite crystals coat the back. 8.6 x 5.4 x 4.7 cm
The mineral giving these calcites their beautiful dove-grey color has generally been identified as boulangerite, but I am assured by a dealer who brings them in that the mineral is actually jamesonite. Typically, these are seen as rosettes, but this one has a remarkable and beautiful sculptural form, featuring two intergrown pear-shaped clusters. Olive-colored siderite crystals decorate the display face. 9 x 5.5 x 3.2 cm
An excellent and CLASSIC specimen of highly lustrous and gemmy bladed yellow-green siderite crystals to 3.2 cm on lustrous, translucent colorless to milky-white flattened dolomite rhombs. What makes this piece even more special, are the tiny lustrous pyrrhotite plates and iridescent cubanite blades richly scattered on all the larger dolomite and siderite crystals. Old dealer stock of Dr. Gary Hansen and not shown since the early 1980s! 7.5 x 5.6 x 3.4 cm
7.0 x 3.8 x 3.8 cm. This association is rather uncommon in the mineral world, and you just don't see specimens with such great quality and aesthetics from this area. 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 fantastic display piece featuring sharp metallic grey pseudmorphs of Hematite after Siderite aesthetically perched along the prism faces of a translucent, sharp, deep color group of Smoky Quartz crystals. Some minor associated pink and white Microcline at the base of the piece make for a nice touch as well. 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.
5.8 x 4.4 x 3.6 cm. The Siete Suyos mine (Seven Servants mine) is sometimes considered to be part of the Animas mine, and it is often difficult to know where specimens are from because several mines in the area share the same vein system. The good news is that I directly obtained this specimen from the miner who collected it, so I know for certain where it came from. I honestly have never seen any specimens from this locality before. This piece features several excellent quality, sharp, gemmy, greenish-brown crystals of Siderite which are sitting upon an unusual crystal of lustrous Pyrite (possibly a pseudomorph after Siderite) which are associated with minor grey crystals of the rare sulfide, Stannite. The largest Siderite crystal group measures 2.7 cm across. For Siderite, the quality is impressive for Bolivia, as I rarely have seen such sharp and gemmy crystals from any Bolivian locality. So far, this find was very limited.
MD-271561 - Hematite, Siderite, Quartz (Var: Smoky Quartz), Microcline - - Archived
R. A. Kosnar claim, Yucca Hill, Steven's Ranch, Lake George, Park Co., Colorado, USA
small cabinet, 6.2 x 3.7 x 3.6 cm.
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6.2 x 3.7 x 3.6 cm. This association is rather uncommon in the mineral world, and you just don't see such fine specimens from this area. 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 fine piece featuring sharp metallic grey pseudomorphs of Hematite after Siderite (largest measures 1.0 cm) aesthetically perched along the prism faces of translucent, sharp, deep colored Smoky Quartz crystals on minor associated pink and white Microcline. This specimen was collected over 30 years ago (Summer of 1977) when Richard Kosnar found some of the finest color Amazonite from Colorado extant. Ex. Richard Kosnar Collection.
8.0 x 4.3 x 4.2 cm. Lustrous, light brown, flattened siderite rhombs with contrasting glassy quartz crystals cover the blocky matrix of massive siderite with quartz on this excellent old-time specimen from the Germany’s Georg Mine, Rhineland-Palatinate. Ex. J. Cilen and Robert Whitmore Collections.
14.7 x 11 x 4.5 cm. An outstanding pseudomorph of Siderite and Sphalerite replacing the original Calcite. This variety of replacement is an epimorph, where the later minerals have formed over and then casted the original crystal, which has now vanished and dissolved away leaving the hollow shell intact. The form is superb, and the color variations between terminations and faces, as well as the metallic luster on some of the crystals, creates a visual splendor and presence not often seen in something non-gemmy - especially in pseudomorphs. This reminds one of the great old-time, Hemimorphite pseudomorphs from Missouri, but with sharper crystals yet. The largest crystal in this magnificent plate is an amazing 6.5 cm long. A fabulous specimen, dramatic in appearance, from a major find. Ex. Charlie Key.
5.7 x 5.5 x 5.3 cm. An outstanding pseudomorph of Siderite and Sphalerite replacing the original Calcite. This variety of replacement is an epimorph, where the later minerals have formed over and then casted the original crystal, which has now vanished and dissolved away leaving the hollow shell intact. The form is superb, and the color variations between terminations and faces, as well as the metallic luster on some of the crystals, creates a visual splendor and presence not often seen in something non-gemmy - especially in pseudomorphs. This magnificent crystal, about 5.3 cm long, sits absolutely perfect on the matrix, and it is accented by a smaller crystal at the base. Very aesthetic. Ex. Charlie Key.
A REALLY fine specimen of this old classic material, now almost never seen for sale...this one features a thick blanket of chocolatey-brown Sphaerosiderite almost completely draping over the original thin blades of clear barite. I have seen just a few of these for sale in the last ten years, and this is one of the most aesthetic and displayable of them. You will not see anything like it from anywhere else, to my knowledge - its just a freak occurrence unique to this locality. 5.8 x 5.2 x 3.7 cm
14.8 x 12.8 x 5.8 cm. A beautiful 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 couple broken crystals on the specimen reveal. The striking cluster at the top really jumps out at you. The large crystal is 5.2 cm. Interesting, totally unique material from this find.
5.3 x 3.2 x 2.3 cm. The Siete Suyos mine (Seven Servants mine) is sometimes considered to be part of the Animas mine, and it is often difficult to know where specimens are from because several mines in the area share the same vein system. I directly obtained this specimen from the miner who collected it, so I know for certain where it came from. I honestly have never seen any specimens of this material from this locality before. This piece features several excellent, sharp, lustrous, gemmy, greenish-brown crystals of Siderite measuring up to 8 mm which are sitting upon unusual crystals of lustrous Pyrite (which are actually pseudomorphs after Siderite) which are associated with minor grey crystals of the rare sulfide, Stannite. For Siderite, the quality is impressive for Bolivia, as I rarely have seen such sharp and gemmy crystals from any Bolivian locality.
7.5 x 6.6 x 4.5 cm. A fine 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. The striking large crystal is 4.0 cm tall and is complete-all-around. The two major crystals are pristine. 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 side reveals.
15.1 x 9.4 x 5.0 cm. A very rich and aesthetic large cabinet specimen of clusters of lustrous, flattened, honey-brown siderite rhombs to 6 mm covering hematite matrix from the Sterling Mine in Antwerp, New York. Choice and old material, seldom available today. Ex. Russell Jones Collection.
12.2 x 6.3 x 2.7 cm. This is a large matrix plate of sparkling quartz, which nicely sets off the deep blue, glassy crystals of lazulite (to 7mm). Minor accents of brown siderite are present as well. Overall, this is a big and showy specimen, and the combination lends it a nice sparkly look. Old material. Ex. Harold Urish Collection.
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Rob Lavinsky, rob@irocks.com
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