Gabbros

Some articles on gabbros, gabbro:

Scapolite Bearing Rocks - Scapolite-hornblende Rocks
... They have been called spotted gabbros, but usually do not contain feldspar, the white spots being entirely scapolite while the dark matrix enveloping them is an aggregate of ... for there can be no doubt that they were once gabbros, consisting of plagioclase and pyroxene) into scapolite is due to the percolation of chloride ... But it is found that in these gabbros there are veins of a chlorine-bearing apatite, which must have been deposited by gases or fluids ascending from below ...
Granulite
... rocks of this country, they are mingled with granites, gneisses, gabbros, amphibolites, mica schists and many other petrographical types ... The granites pass into gneiss and granulite the gabbros into flaser gabbro and amphibolite the slates often contain andalusite or chiastolite, and show transitions to ... and garnet chemically they resemble the gabbros ...
Gabbro - Petrology
... Gabbro is dense, greenish or dark-colored and contains pyroxene, plagioclase, amphibole, and olivine (olivine gabbro when olivine is present in a large amount) ... Quartz gabbros are also known to occur and are probably derived from magma that was over-saturated with silica ... Essexites represent gabbros whose parent magma was under-saturated with silica, resulting in the formation of the feldspathoid mineral nepheline ...