Editing Diabase (section)

==Petrography==
[[File:Fair Head - geograph.org.uk - 817076.jpg|thumb|[[Fair Head]], Northern Ireland]]
Diabase normally has a fine but visible [[Rock microstructure|texture]] of [[euhedral]] [[lath]]-shaped [[plagioclase]] [[crystal]]s (62%) set in a finer matrix of [[pyroxene|clinopyroxene]], typically [[augite]] (20–29%), with minor [[olivine]] (3% up to 12% in olivine diabase), [[magnetite]] (2%), and [[ilmenite]] (2%).<ref>Klein, Cornelus and Cornelius S. Hurlbut Jr.(1986) ''[[iarchive:manualofmineralo00klei|Manual of Mineralogy]]'', Wiley, 20th ed., p. 483 {{ISBN|0-471-80580-7}}</ref> Accessory and alteration [[mineral]]s include [[hornblende]], [[biotite]], [[apatite]], [[pyrrhotite]], [[chalcopyrite]], [[serpentine group|serpentine]], [[chlorite group|chlorite]], and [[calcite]]. The texture is termed ''diabasic'' and is typical of diabases. This diabasic texture is also termed ''interstitial''.<ref>Morehouse, W. W. (1959) ''The Study of Rocks in Thin Section'', Harper & Row, p. 160</ref> The [[feldspar]] is high in [[anorthite]] (as opposed to [[albite]]), the [[calcium]] [[endmember]] of the plagioclase anorthite-albite solid solution series, most commonly [[labradorite]].