Siderite Minerals

Siderite belongs to the group of calcite minerals, a group of related carbonates that are isomorphic to each other. They are similar in many physical properties and can partially or completely replace each other to form a series of solid solutions. All members of the calcite group crystallize in the trigonal system and have perfect rhombohedral cleavage

 

Siderite Minerals
Siderite Twinned Crystal Aggregate On Orthoclase
Presenting this lovely and colourful specimen, featuring an isolated twinned crystals of Siderite on twinned gem Orthoclase matrix. The siderite crystals has magnificent vitreous wet metallic lustre with vibrant brown colour. The orthoclase twinned matrix creating an awesome contrast of...
$350.00
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Gorgeous Aggregate Of Siderite Crystals On Matrix
Presenting this attractive and lovely looking cabinet size specimen of Siderite from the northern area of Pakistan. It featuring numerous so well crystallised impressive size Siderite crystals nicely positioned on yellowish Limonite matrix. The crystals has magnificent natural art on...
$220.00
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Lovely Crystallography For Calcite With Brow Siderite
Presenting this beautiful and attractive specimen of well formed Calcite with nice detail Siderite crystal attached. It’s an indeed very good crystallography for the calcite in such perfection in contrast against the brown siderite. It’s well crystallised all around with...
$150.00
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Impressive And Colourful Siderite Crystal Aggregate On Calcite
Presenting this lovely and colourful specimen of Siderite crystal aggregate on Calcite matrix. The siderite crystals are so well crystallised with vibrant brown coloration and magnificent natural art on the crystal surface. The crystals has fine sharp edges and creating...
$150.00
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Lovely And Attractive Specimen Of Siderite Crystal Aggregate With Calcite
Presenting this aesthetic and colourful piece of Siderite specimen. It featuring lovely inter-grown aggregate of multi step crystals on matrix with Calcite. The siderite crystals has magnificent rich brown colour with fine crystal edges and good metallic lustre. It’s an...
$150.00
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Very Well Crystalized Aggregate Of Siderite Crystals On Matrix
Presenting this beautiful and attractive specimen of Siderite crystals nicely attached and perched on matrix. The crystals are highly striated and so well crystalized all around with razor sharp crystal edges. The crystals are so compact and has vibrant brown...
$220.00
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Siderite Minerals

Siderite Description:

Siderite belongs to the  group of calcite minerals, a group of related carbonates that are isomorphic to each other. They are similar in many physical properties and can partially or completely replace each other to form a series of solid solutions. All members of the calcite group crystallize in the trigonal system and have perfect rhombohedral cleavage.   Siderite is readily converted to iron oxide. Brown goethite substitutes for siderite are common. Limonite, an amorphous mineral, is commonly found in rhombohedral crystals as it is often pseudomorphic to rhomboid.   Stone siderite nodules are known to contain fossils of a  variety of plants and animals, especially in open pit coal mines in eastern Illinois and western Indiana, and these stones are  removed before the carbon veins are exposed. Commonly found in rocks

Siderite Associations:

Chemical Formula FeCO3
Composition Iron carbonate, usually containing some magnesium and calcium, sometimes also magnesium, zinc, and cobalt.
Variable Formula (Fe,Mg,Ca,Mn,Zn,Co)CO3
Color Light to dark brown, yellow-brown, light yellow, yellow-green, greenish-brown, gray, and white.
Streak White
Hardness 3.5 - 4
Crystal System Hexagonal

Siderite Color:

Siderite is carbonate of iron, and is of a light brown color, but can also be gray, yellow, yellowish brown, greenish brown and reddish brown because of impurities or the alteration to goethite.

 

 

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