Noun
A name originally given by the Italians to a kind of serpentine, later to the rock called euphotide, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene (diallage) and labradorite, with sometimes chrysolite (olivine gabbro).
Source: Webster's dictionaryDue to its variant nature, the term "gabbro" may be applied loosely to a wide range of intrusive rocks, many of which are merely "gabbroic". Source: Internet
The calcium rich plagioclase feldspar ( labradorite bytownite ) and pyroxene content vary between 10% - 90% in gabbro. Source: Internet
Etymology The term "gabbro" was used in the 1760s to name a set of rock types that were found in the ophiolites of the Apennine Mountains in Italy. Source: Internet
Gabbro Photomicrograph of a thin section of gabbro. Source: Internet
Ocellar (orbicular) varieties of gabbro can be used as ornamental facing stones, paving stones and it is also known by the trade name of 'black granite', which is a popular type of graveyard headstone used in funerary rites. Source: Internet
The quartz content in gabbro is less than 5% of total volume. Source: Internet