norite

The granitic rocks included granite, gneisses, syenites and norite.

New York at the Louisiana Purchase Exposition, St. Louis 1904 Report of the New York State Commission DeLancey M. Ellis

Masses sufficiently large for cutting are found in the norite of the Kupferberg in the Fichtelgebirge, and in the serpentine of Kraubat near Leoben in Styria.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Various

These are situated in the basal portions of a great norite intrusive, and are ascribed to segregation of the sulphides as the rock solidified.

The Economic Aspect of Geology 1915

The occurrence of these heavy ores near the base of the norite naturally suggests that they were segregated by sinking to the bottom of the molten magma, but this conclusion implies certain physical conditions of the magma which have not yet been proved.

The Economic Aspect of Geology 1915

Locally both the ores and the associated granitic rocks replace the main norite body in such a fashion as to indicate their slightly later crystallization.

The Economic Aspect of Geology 1915

Near the ores there are likely to be granitic rocks, which, like the ores, seem to be segregations from the norite magma.

The Economic Aspect of Geology 1915

Their textures and their intercrystallization with the primary minerals of the igneous rock have suggested that they are essentially a part of the norite mass, and that they crystallized during some segregative processes which were effective before the magma had solidified.

The Economic Aspect of Geology 1915

York the emery deposits are segregations of aluminum and iron oxides in norite (a basic igneous rock).

The Economic Aspect of Geology 1915

However, the intimate association of the ores with the primary minerals in the magma, together with their absence from higher parts of the norite and from the extraneous rocks far from the contact, indicate to other investigators that they were not brought in from outside in vagrant solutions which followed the intrusion of the main magma, but that they were segregated within the magma essentially in place.

The Economic Aspect of Geology 1915

The few ore bodies known have been formed as the result of unusual segregation of the nickel in highly magnesian igneous rock of the norite or gabbro type, at the time of its solidification or soon after; and in some cases, in order to produce the nickel ore, still further concentration by the agency of weathering has been necessary.

The Economic Aspect of Geology 1915