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Gabbro

A rock classification type
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About GabbroHide

A gabbroid composed of 10-90% Ca-dominant plagioclase and >5% clinopyroxene.
A group of basic intrusive igneous rocks composed principally of basic plagioclase (commonly labradorite or bytownite) and clinopyroxene (augite), with or without olivine and orthopyroxene; also, any member of that group. It is the approximate coarse-grained/intrusive equivalent of basalt. Apatite, magnetite, and ilmenite are common accessory minerals. Commonly dark-colored.


Unique IdentifiersHide

Mindat ID:
48275
Long-form identifier:
mindat:1:1:48275:0
GUID
(UUID V4):
2bc6ef49-ffbc-4fb0-9994-a0e2a6df89a6

Classification of GabbroHide

QAPF_P_10.png

Gabbro is in section 10 of the QAPF diagram.

Sub-divisions of GabbroHide

Mineralogy of GabbroHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Mafic mineralsA petrological term for dark, rock-forming minerals rich in magnesium and/or iron.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeA commonly used informal name for dark green to black amphiboles, largely in the Hornblende Root Name ...
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

Age distributionHide

Recorded ages:
Neochaotian to Neogene : ~4600 Ma to 12.8 ± 1.3 Ma - based on 17 recorded ages.

Synonyms of GabbroHide

Other Language Names for GabbroHide

Irish Gaelic:Gabró

Varieties of GabbroHide

Allalin-gabbroVariety of gabbro from the Allalinhorn (mountain) in Switzerland.

This variety, which forms part of the Zermatt–Saas ophiolite, contains both relics of the original igneous mineralogy (olivine-gabbro and troctolite) and high-pressure metamorphic assemb...

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Gabbro associated with Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
6 photos of Gabbro associated with Pyroxene GroupADSi2O6
3 photos of Gabbro associated with QuartzSiO2
2 photos of Gabbro associated with LaumontiteCaAl2Si4O12 · 4H2O
2 photos of Gabbro associated with PyriteFeS2
2 photos of Gabbro associated with Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
1 photo of Gabbro associated with Dunite
1 photo of Gabbro associated with CalciteCaCO3
1 photo of Gabbro associated with Chlorite Group
1 photo of Gabbro associated with Limonite

Internet Links for GabbroHide

References for GabbroHide

 
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