Editing Gabbro (section)

=== Gabbroids ===
Gabbroids (also known as gabbroic-rocks<ref name="bgs"/>) are a family of coarse-grained igneous rocks similar to gabbro:{{sfn|Jackson|1997|loc="gabbroid"}}
* Quartz gabbro contains 5% to 20% quartz in its QAPF fraction. One example is the ''cizlakite'' at [[Pohorje]] in northeastern Slovenia,<ref>Le Maitre, R. W.; et al., eds., 2005, ''Igneous Rocks: A Classification and Glossary of Terms,'' Cambridge Univ. Press, 2nd ed., p. 69, {{ISBN|9780521619486}}</ref>
* Monzogabbro contains 65% to 90% plagioclase out of its total feldspar content.
* [[Quartz monzogabbro]] combines the features of quartz gabbro and monzogabbro. It contains 5% to 20% quartz in its QAPF fraction, and 65% to 90% of its feldspar is plagioclase.
* Foid-bearing gabbro contains up to 10% feldspathoids rather than quartz. "Foid" in the name is usually replaced by the specific feldspathoid that is most abundant in the rock. For example, a [[nepheline]]-bearing gabbro is a foid-bearing gabbro in which the most abundant feldspathoid is nepheline.
* Foid-bearing monzogabbro resembles monzogabbro, but containing up to 10% feldspathoids in place of quartz. The same naming conventions apply as for foid-bearing gabbro, so that a gabbroid might be classified as a [[leucite]]-bearing monzogabbro.<ref name="bgs"/>

Gabbroids contain minor amounts, typically a few percent, of iron-titanium oxides such as [[magnetite]], [[ilmenite]], and [[ulvospinel]]. [[Apatite]], [[zircon]], and [[biotite]] may also be present as accessory minerals.<ref name=BlattTracy1996/>

Gabbro is generally coarse-grained, with crystals in the size range of 1&nbsp;mm or larger. Finer-grained equivalents of gabbro are called [[diabase]] (also known as [[dolerite]]), although the term ''microgabbro'' is often used when extra descriptiveness is desired. Gabbro may be extremely coarse-grained to [[pegmatitic]].<ref name="bgs"/> Some pyroxene-plagioclase [[Cumulate rock|cumulates]] are essentially coarse-grained gabbro,<ref>{{cite journal |last1=Beard |first1=James S. |title=Characteristic mineralogy of arc-related cumulate gabbros: Implications for the tectonic setting of gabbroic plutons and for andesite genesis |journal=Geology |date=1 October 1986 |volume=14 |issue=10 |pages=848–851 |doi=10.1130/0091-7613(1986)14<848:CMOACG>2.0.CO;2|bibcode=1986Geo....14..848B }}</ref> and may exhibit acicular crystal habits.<ref>{{cite journal |last1=Nicolas |first1=Adolphe |last2=Boudier |first2=Françoise |last3=Mainprice |first3=David |title=Paragenesis of magma chamber internal wall discovered in Oman ophiolite gabbros |journal=Terra Nova |date=April 2016 |volume=28 |issue=2 |pages=91–100 |doi=10.1111/ter.12194|bibcode=2016TeNov..28...91N |s2cid=130338632 }}</ref>

Gabbro is usually [[equigranular]] in texture, although it may also show [[ophitic texture]]<ref name=BlattTracy1996/> (with laths of plagioclase enclosed in pyroxene<ref>{{cite journal |last1=Wager |first1=L. R. |title=A Note on the Origin of Ophitic Texture in the Chilled Olivine Gabbro of the Skaergaard Intrusion |journal=Geological Magazine |date=October 1961 |volume=98 |issue=5 |pages=353–366 |doi=10.1017/S0016756800060829|bibcode=1961GeoM...98..353W |s2cid=129950597 }}</ref>).