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
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...
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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...
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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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