Image: <bdi><a href="https://www.wikidata.org/wiki/Q108103612" class="extiw" title="d:Q108103612"><span title="Wikipedian and OpenStreetMap mapper from Cologne, Open Data activist">Raimond Spekking</span></a></bdi> (CC BY-SA 4.0)
trigonalcommonCarbonates
Siderite
FeCO₃
Siderite typically forms rhombohedral crystals, often with curved faces, or can be massive, granular, or botryoidal. Its color ranges from yellowish-brown to dark brown, sometimes gray or greenish.
Siderite Physical Properties
Mohs Hardness
3.5Crystal System
trigonalLuster
vitreousStreak Color
whiteCleavage
perfect rhombohedral {1011}Fracture
unevenSpecific Gravity
3.96Colors
yellowish-brown, brown, reddish-brown, gray, green, white, colorlessTransparency
transparentType Locality
Friedrich Wilhelm mine, Herdorf, Siegerland, Westphalia, GermanyMineral Group
CarbonatesUses
minor ore of iron, flux in steel production, collectorAssociated Minerals
chalcopyrite, quartzRarity
commonGeological Context
Siderite forms in sedimentary environments, often in concretions, or as a gangue mineral in hydrothermal veins. It is also found in metamorphic rocks and is common in iron ore deposits.
