Haematites sentence example
These of course are the oldest of our ores, and from deposits of like age, especially those of the more readily decomposed silicates, has come the iron which now exists in the siderites and red and brown haematites of the later geological formations.
The rich beds near Lake Superior, chiefly red haematite, yielding at present about 55% of iron, are thought to contain between II and 2 billion tons, and the red and brown haematites of the southern states about to billion tons.
The iron deposits are very extensive, and the ores consist of red haematites, magnetites, titanic, chrome and manganese irons.
The ore occurs in two forms, haematites and limonites; the specular hematites often being grouped, for practical purposes, into two classes - those occurring in porphyry and those occurring in sandstone.
The haematites are found not only in the archean porphyries but in Cambrian limestone and sandstone, and in the sub-Carboniferous formations; while the limonites are confined almost exclusively to the Cambrian.Advertisement
The bedded haematites and limonites have been little exploited.