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Mineralpedia Details for Siderite

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Siderite

Siderite

Named after the Greek sideros, meaning “iron,” in reference to the iron in the composition. Quite common with thousands of localities, Siderite is found as a constituent of sedimentary bedded iron ores and metamorphic iron formations. It can also be found in association with metallic hydrothermal veins as well as in carbonatites, concretions, and occasionally in pegmatites. Siderite is paramagnetic, can be attracted in the presence of an externally applied magnetic field.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/siderite.pdf

Formula
FeCO3 
Crystal System
Trigonal 
Crystal Habit
Tabular, Massive, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
yellowish brown, brown, gray, yellowish gray, greenish gray 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
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Siderite from Vekol mine, Pima Co., Arizona, United States

Siderite
            from Vekol mine, Pima Co., Arizona, United States Chocolate brown saddle shaped crystals to 6mm.
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Siderite from Pribram, Bohemia, Czech Republic

Siderite
            from Pribram, Bohemia, Czech Republic

Thick, brown discoidal crystals of Siderite to 1.8cm.

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SIDERITE from Neudorf, Harz, Germany

SIDERITE
            from Neudorf, Harz, Germany

Note: For a closer representation of the color see the close-up photos. It's is a brownish yellow color.

A recent Mineralogical Record article (v. 43 n. 1) authored by Gunther Neumeier descibed the Neudorf district, located in the lower Harz mountains of Saxony-Anhalt, Germany. Mining at Neudorf's lead-zinc-silver mining district dates back to the 10th century and was one of the most important and productive districts in the area. Specimens were collected dating back to the early 1800's, most notably Boulangerite, Galena, and Siderite to which the district is most famous. August Krantz (1809-1872) was a notable mineral dealer of Neudorf specimens. This specimen carrries the label from Friedrich Krantz (1859-1926), August's nephew.

Siderite was actually mined as iron ore at Neudorf, according to Neumeier (2012 MR). Neudorf is a classic Siderite locality known worldwide as having lustrous and almost gemmy crystals. Siderite from Neudorf was one of Bancroft's World's Most Finest Minerals. Extra shipping applies. This specimen is no exception and has good, old provenance. The crystals themselves are up to 2cm on edge and there is only one with a minor ding. Considering how old this specimen is, that's not too bad! You can also see in the photos a few clear needle Quartz crystals. Highly sought after locality. Has two old lables as shown in the provenance tab, however, the tags show a number of 374 and the number on the specimen is 373. Undoubtedly, this specimen was one in a series and is a simple case of mix-up, perhaps a mistake from the University of Chicago since the number on the specimen looks as though it post dates the older Krantz label. Siderite from Neudorf was one of Bancroft's World's Most Finest Minerals. Extra shipping applies.

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Siderite from Camborne, Cornwall, England

Siderite
            from Camborne, Cornwall, England

Excellent well-formed yellow to brown SIderite crystals covering the Quartz matrix. Neat specimen showing the mineralization style on the backside over large Quartz crystals.

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Siderite from Champion mine, Marquette Co., Michigan, United States

Siderite
            from Champion mine, Marquette Co., Michigan, United States

A large impressive cleaved mass of dark brown SIderite occuring with specular Hematite and some Pyrite. A nice specimen from this mining area historically important to the upper midwest economy.

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Siderite from Tsumeb mine, Tsumeb, Namibia

Siderite
            from Tsumeb mine, Tsumeb, Namibia

This was originally labeled as Beudantite. However, I am sure it is amber brown, scalenohedral Siderite to 4mm. It is drop dead gorgeous under the scope.

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Siderite from Rožňava, Rožňava Co., Košice, Slovakia

Siderite
            from Rožňava, Rožňava Co., Košice, Slovakia

Superb rhombic greenish brown Siderite crystals to 1.5cm. l

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Siderite from Obercassel, Bonn, Siebengebirge, North Rhine-Westphalia, Germany

Siderite
            from Obercassel, Bonn, Siebengebirge, North Rhine-Westphalia, Germany

An old-timer from the University of Chicago with tag purchased by Charles Noll from another collector. It is handsome specimen with large curved rhombic crystals to 9mm topped off with Chalcopyrite crystals to 1cm. 

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Siderite from Chipman Silver mine, Newbury, Essex Co., Massachusetts, United States

Siderite
            from Chipman Silver mine, Newbury, Essex Co., Massachusetts, United States

Reddish brown cleavages of Siderite to 2cm. 

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