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- n. Plural form of eruptive.
Sorry, no etymologies found.
The thing that is essential is the proper amount, and the right kind of eruptive, because it is from the eruptives that the right conditions exist for obtaining this ore.
There is one other thing that seems to be essentially geological for these ores, and that is, masses of eruptives -- such a rock as the farmers in the country gather up and call green hardheads.
They are mostly green schists, mixed with green eruptives, and they form a large part of the rocks.
Of the rocks observed, by far the greater number are foliated basic eruptives, -- schists and gneisses.
Geological Survey of India, show these great ranges to be essentially formed of folded sediments penetrated by vast masses of granite and other eruptives.