Editing Gabbro (section)

==Uses==
Gabbro often contains valuable amounts of [[chromium]], [[nickel]], [[cobalt]], [[gold]], [[silver]], [[platinum]], and [[copper]] [[sulfide]]s.<ref>{{cite journal |last1=Iwasaki |first1=I. |last2=Malicsi |first2=A.S. |last3=Lipp |first3=R.J. |last4=Walker |first4=J.S. |title=By-product recovery from copper-nickel bearing duluth gabbro |journal=Resources and Conservation |date=August 1982 |volume=9 |pages=105–117 |doi=10.1016/0166-3097(82)90066-9}}</ref><ref>{{cite book |last1=Lachize |first1=M. |last2=Lorand |first2=J. P. |last3=Juteau |first3=T. |chapter=Cu-Ni-PGE Magmatic Sulfide Ores and their Host Layered Gabbros in the Haymiliyah Fossil Magma Chamber (Haylayn Block, Semail Ophiolite Nappe, Oman) |title=Ophiolite Genesis and Evolution of the Oceanic Lithosphere |series=Petrology and Structural Geology |date=1991 |volume=5 |pages=209–229 |doi=10.1007/978-94-011-3358-6_12|isbn=978-94-010-5484-3 }}</ref><ref>{{cite journal |last1=Arnason |first1=John G. |last2=Bird |first2=Dennis K. |title=A Gold- and Platinum-Mineralized Layer in Gabbros of The Kap Edvard Holm Complex: Field, Petrologic, and Geochemical Relations |journal=Economic Geology |date=August 2000 |volume=95 |issue=5 |pages=945–970 |doi=10.2113/gsecongeo.95.5.945}}</ref> For example, the [[Merensky Reef]] is the world's most important source of platinum.{{sfn|Philpotts|Ague|2009|pp=384-390}}

Gabbro is known in the construction industry by the trade name of ''black granite''.<ref>{{cite book |last1=Winkler |first1=Erhard M. |title=Stone in architecture : properties, durability |date=1994 |publisher=Springer-Verlag |location=Berlin |isbn=9783540576266 |page=101 |edition=3rd completely rev. and extended}}</ref> However, gabbro is hard and difficult to work, which limits its use.<ref>{{cite book |last1=National Research Council |title=Conservation of Historic Stone Buildings and Monuments |date=1 January 1982 |page=80 |doi=10.17226/514|isbn=978-0-309-03275-9 }}</ref>

The term "indigo gabbro" is used as a common name for a mineralogically complex rock type often found in mottled tones of black and lilac-grey. It is mined in central Madagascar for use as a semi-precious stone. Indigo Gabbro can contain numerous minerals, including quartz and feldspar. Reports state that the dark matrix of the rock is composed of a mafic igneous rock, but whether this is basalt or gabbro is unclear.{{citation needed|date=May 2023}}