siderite

—sideritic /sid'euh rit"ik/, adj.

/sid"euh ruyt'/, n.

1. Also called chalybite. a common mineral, iron carbonate, FeCO₃, usually occurring in yellowish to deep-brown cleavable masses: a minor ore of iron.

2. a meteorite consisting almost entirely of metallic minerals.

[1570-80, in sense "loadstone"; 1845-50 for def. 1; SIDER- + -ITE¹; in obs. sense, var. of siderites < L siderites < Gk siderítes loadstone]

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or chalybite

Iron carbonate (FeCO₃), a widespread carbonate mineral that can be an ore of iron.

The mineral commonly occurs in thin beds with shales, clay, or coal seams (as sedimentary deposits) and in hydrothermal metallic veins (as gangue, or waste rock).

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▪ mineral

also called  chalybite 

 iron carbonate (FeCO₃), a widespread mineral that is an ore of iron. The mineral commonly occurs in thin beds with shales, clay, or coal seams (as sedimentary deposits) and in hydrothermal metallic veins (as gangue, or waste rock). Manganese (Mn), magnesium (Mg), and calcium generally substitute in part for iron; siderite forms a complete solid-solution (chemical replacement) series with magnesite (MgCO₃), another with rhodochrosite (MnCO₃), and an incomplete one with ferroan calcite. For detailed physical properties, see carbonate mineral (table).

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