Siderite effervesces with strong acid; and this separates it from all other rocks, except limestone and dolomite; and from these it is distinguished by its high specific gravity.
As a mineral, siderite is often light colored; but as a rock it is always dark, and usually black, from admixture chiefly of carbonaceous matter.
In studying dynamical geology, we have learned (page 28) the reason for the intimate association ofsiderite with beds of coal, and this accounts equally for the carbon contained in the rock itself.
The original condition is indicated by the facts that deep below the surface, in zones protected from weathering solutions, siderite and greenalite are abundant, and that they show complete gradation to hematite in approaching the surface.
Quartzite (instead of limestone) is an unusual locus of replacement ores, and siderite is an unusual gangue.
The Coeur d'Alene deposits are almost unique in that they contain galena as vein-fillings and replacements in quartzite, with a gangue of siderite (iron carbonate).
The clayey siderite of the British coal measures is called "clay band," and that containing bituminous matter is called "black band.
In Austria-Hungary, besides the famous Styrian Erzberg, with its siderite ore bed about 450 ft.
The most important British ore deposit is the Lower Cleveland bed of oolitic siderite in the Middle Lias, near Middlesborough.
This siderite is specially interesting on account of its distinctly metallic character.
This is one of the ordinary stony meteorites, and is thus contrasted with the Rowton siderite which we have just been considering.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "siderite" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: alabaster; asphalt; fireball; meteor; mineral; ore; radiant
