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Mineral Specimens with Siderite
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5.3 x 4. 3x 3.0 cm. 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 with gem Quartz crystals and tan Siderite "rosettes".
12.7 x 10.8 x 7.2 cm. This is a very interesting specimen of Limonite forming incredible "casts" after rhombic Siderite and octahedral Pyrite crystals. The sharpness and detail is so amazingly well preserved, yet upon close inspection, one can clearly see that these cavities are hollow inside.
7.4 x 5.8 x 2.5 cm. A classic, old-time and superb combination specimen from a historic French locale - Allevard, Rhone-Alpes. Water-clear, glassy quartz crystals are set upright on the thin matrix plate amidst lustrous, striated, translucent, olive-green siderite rhombs. The large siderite rhomb is 2.4 cm. Ex. George Elling Collection.
11.6 x 9.7 x 5.0 cm. The Roxbury Iron Mines are well known and were first discovered in 1750. They were a big part of early American mining. This is a hefty specimen of solid siderite, with sharp, really lustrous crystals atop a 3-dimensional knoll of the massive siderite below. Ex. Philadelphia Academy of Sciences Collection.
11.7 x 6.5 x 5.7 cm. A huge, 7.5 cm siderite crystal sits upright on a sculptural matrix on this fine cabinet specimen from the Mt. St-Hilaire of Quebec. The front of the yellowish-brown siderite has stepped-faced, rhombic faces and has a silky lustre. This is a complete all-around and undamaged crystal, with two of the sides having an overgrowth coating. The small siderite rhombs at the base are a superb accent. Ex. James Zigras Collection.
7.0 x 5.1 x 3.5 cm. An unusual specimen with sharp hexagonal siderite crystals perched upon pyrite. Very unusual for the locality. Ex. Academy of Natural Sciences Philadelphia Collection.
2.9 x 1.8 x 1.7 cm. These are the typical very deep teal-blue, sharp and glossy crystals of lazulite that set the standard for the species at this locality in Canada. There is a pretty association here with gemmy crystals of siderite, and minor quartz.
6.0 x 5.5 x 1.8 cm. An old-time, uncommon and showy siderite varietal, sphaerosiderite, from the Baia Sprie Mine (Felsobanya) of Romania. The thin sulfide crust is covered with waxy, low lustre, dark honey-brown, microcrystalline, botryoidal siderite. Comes with a Dr. F. Fuchs, Bonn label, which from the style, appears to be around 1900-1910. The collection this came out of was a museum stash dating to prior to World War I.
1.0 x 0.9 x 0.5 cm. Ludlockite is another of the very rare mineral species for which the Tsumeb Mine is renowned and the Type Locality. This very fine thumbnail has superb sprays of bright coppery red-orange, felt-like, acicular ludlockite needles on germanite matrix. A super accessory mineral, a glassy, red zincian siderite rhomb is on the lower right hand corner of the ludlockite. Ex. Ed Ruggiero Collection, who purchased this rarity from the Zweibels in 1976.
15.4 x 12.5 x 8.1 cm. A very large, beautiful and interesting combination specimen from the classic Panasqueira locality - in fact, a combination that is quite familiar from there, but not in the unique form. What you have is a single large, complete quartz crystal jutting up at the back of an immense crystal of siderite – that’s right that is not a chunk of tan matrix, but a gigantic, complete discus-shaped crystal of siderite. At the front edge, the siderite has grown around a jumble of large ferberite crystals. Smaller siderite crystals have also grown on the quartz crystal, and the quartz has partially grown around them. Ex. Nowakowski Collection.
A VERY NICE combo of the classic species from Neudorf, though they only rarely occur together [Note: at Neudorf, siderite is a very common associate of galena - pH] and now, up to hundreds of years after being mined, specimens are so scarce as to be almost unavailable. What a balanced piece?! Ex. Seaman Museum with label 4.6 x 4.0 x 1.5 cm
1.7 x 1.4 x 1.3 cm. Although this may not look like much to most collectors, others will recognize it as an extraordinarily rich specimen of the extremely rare species Kegelite, a lead species found in macrocrystals only at Tsumeb (the type locality). This piece has a rich covering of crystals with characteristic pearlescent sheen to them. The little clusters reach 1mm, which is exceptional in size and richness for the species. A sharp, lustrous, gemmy siderite crystal is in attendance for contrast. Only few valid kegelite specimens ever were recovered, and most available pieces are trims from those original pieces (this being no exception, a trim that previous owner Eric Asselborn said he obtained in trade in the 1980s, and from one of the specimens in BMNH holdings). Analysis by Bart Cannon confirmed the ID. Another trim from this same specimen was also in the Asselborn collection, and is now in the Smithsonian Institution. Ex. Eric Asselborn Collection.
A VERY SIGNIFICANT silver for the locality, with great aesthetics as well! The entire top half of the specimen is a solid, intricate mass of silver wires and curlicues! From the collection of former mineral dealer Tony Fraser, who in the mid-90's gave up much of his mineral collection and became a gold nugget dealer down under. 5.5 x 5.5 x 4 cm
A superb thumbnail of this rare species, from THE major find in the mid-1980s at this classic locality. The main crystal, perched nicely on matrix, is 1 cm 2.6 x 1.7 x 1 cm
10.2 x 7.4 x 6.8 cm. This is a rare pseudomorph specimen from Dal’negorsk. What you have is a cluster of huge, sharp ilvaites that have been completely (it appears) replaced by tan-colored siderite. There are two main clusters of tightly-intergrown crystals. Their faces and terminations are sharply preserved. The fractures you see are natural, having occurred probably due to dessication in the pocket.
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Rob Lavinsky, rob@irocks.com
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share specimen![Cassiterite, Quartz, Siderite from Viloco Mine (Araca mine), Loayza Province, La Paz Department, Bolivia [db_pics/mdpics/MD-196020a.jpg]](db_pics/mdpics/MD-196020a.jpg)
![Limonite, Siderite, Pyrite from Kami Mine, Ayopaya Province, Cochabamba Department, Bolivia [db_pics/mdpics/MD-196035a.jpg]](db_pics/mdpics/MD-196035a.jpg)
![Siderite, Quartz from Allevard, Isère, Rhône-Alpes, France [db_pics/mdpics/MD-196092a.jpg]](db_pics/mdpics/MD-196092a.jpg)
![Siderite from Roxbury Iron Mine (Shepaug Iron Company Mine; Shepaug Spathic Iron and Steel Company Mine), Mine Hill, Roxbury, Litchfield Co., Connecticut, USA [db_pics/mdpics/MD-199900a.jpg]](db_pics/mdpics/MD-199900a.jpg)
![Siderite from Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada [db_pics/mdpics/MD-201726a.jpg]](db_pics/mdpics/MD-201726a.jpg)
![Siderite, Pyrite from Llallagua, Rafael Bustillo Province, Potosí Department, Bolivia [db_pics/mdpics/MD-202133a.jpg]](db_pics/mdpics/MD-202133a.jpg)
![Lazulite, Siderite, Quartz from Rapid Creek, Dawson Mining District, Yukon Territory, Canada [db_pics/mdpics/MD-203062a.jpg]](db_pics/mdpics/MD-203062a.jpg)
![Siderite (Var: Sphärosiderite) from Baia Sprie mine (Felsöbánya mine), Baia Sprie (Felsöbánya), Maramures Co., Romania [db_pics/mdpics/MD-203253a.jpg]](db_pics/mdpics/MD-203253a.jpg)
![Siderite (Var: Sphärosiderite) from Baia Sprie mine (Felsöbánya mine), Baia Sprie (Felsöbánya), Maramures Co., Romania [db_pics/mdpics/MD-203253b.jpg]](db_pics/mdpics/MD-203253b.jpg)
![Ludlockite, Siderite (Var: Zincian Siderite), Germanite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-204056a.jpg]](db_pics/mdpics/MD-204056a.jpg)
![Ludlockite, Siderite (Var: Zincian Siderite), Germanite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-204056b.jpg]](db_pics/mdpics/MD-204056b.jpg)
![Quartz, Siderite, Ferberite from Panasqueira, Covilhã, Castelo Branco District, Portugal [db_pics/mdpics/MD-206329a.jpg]](db_pics/mdpics/MD-206329a.jpg)
![Galena, Siderite from Neudorf, Harzgerode, Harz Mts, Saxony-Anhalt, Germany [db_pics/mdpics/MD-20679a.jpg]](db_pics/mdpics/MD-20679a.jpg)
![Kegelite, Siderite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-208647a.jpg]](db_pics/mdpics/MD-208647a.jpg)
![Kegelite, Siderite from Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia [db_pics/mdpics/MD-208647b.jpg]](db_pics/mdpics/MD-208647b.jpg)
![Silver, Siderite, Galena from Broken Hill Proprietary Mine (Proprietary Mine; BHP Mine), Broken Hill, Yancowinna Co., New South Wales, Australia [db_pics/mdpics/MD-20871a.jpg]](db_pics/mdpics/MD-20871a.jpg)
![Chalcostibite, Siderite from Saint-Pons, Ubaye valley, Alpes-de-Haute-Provence, Provence-Alpes-Côte d'Azur, France [db_pics/mdpics/MD-20944a.jpg]](db_pics/mdpics/MD-20944a.jpg)
![Siderite, Ilvaite from Bor Pit (Boron Pit; Bor Quarry), Dal'negorsk B deposit, Dal'negorsk (Dalnegorsk; Tetyukhe; Tjetjuche; Tetjuche), Primorskiy Kray, Far-Eastern Region, Russia [db_pics/mdpics/MD-209847a.jpg]](db_pics/mdpics/MD-209847a.jpg)