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Their product trebled from 1889 to 1903; and in 1907 the output of manganiferous ores amounted to 99,711 tons, valued at $251,207.

Nevertheless, the very high rank in coal and iron 722 interests of the state among the states west of the Mississippi, the presence of excellent manganiferous ores, a central position for distribution, and much the best railway system of any mountain state, indicate that Colorado will almost certainly eventually entirely or at least largely control the trans-Mississippi market in iron and steel.

Of much more importance are the manganiferous and the silver manganiferous ores, which are much the richest of the country.

The ottrelites of the phyllites and ottrelite-schists of Ottrez and other localities in the Belgian Ardennes is a manganiferous variety of chloritoid, but owing to enclosed impurities the analyses differ widely from those of typical chloritoid.

They are similar in their geologic occurrence to many of the iron ores and are often mixed with iron ores as manganiferous iron ores and ferruginous manganese ores.