Gabbro
A rock classification type
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About Gabbro
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.
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 Identifiers
Mindat ID:
48275
Long-form identifier:
mindat:1:1:48275:0
GUID
(UUID V4):
(UUID V4):
2bc6ef49-ffbc-4fb0-9994-a0e2a6df89a6
Classification of Gabbro
Gabbro is in section 10 of the QAPF diagram.
Sub-divisions of Gabbro
- Gabbro
- Cumulitic gabbro
- Orbicular gabbro
- Clinopyroxene-gabbro
- Olivine-gabbro
- Gabbronorite
- Olivine-gabbronorite
- Pyroxene-hornblende-gabbronorite
- Hornblende-gabbro
- Norite
- Clinopyroxene-norite
- Olivine-clinopyroxene norite
- Olivine-norite
- Pyroxene-hornblende-norite
- Olivine-orthopyroxene-gabbro
- Orthopyroxene-gabbro
- Pyroxene-hornblende-gabbro
- Troctolite
- Gabbrodiorite
- Leucogabbro
- Melagabbro
- Quartz-norite
- Microgabbro
- Pegmatitic gabbro
- Quartz gabbro
- Anorthitissite
- Ferrogabbro
- Allalin-gabbro
Mineralogy of Gabbro
Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Mafic minerals | A 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 > Hornblende | A commonly used informal name for dark green to black amphiboles, largely in the Hornblende Root Name ... |
Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Age distribution
Recorded ages:
Neochaotian to Neogene : ~4600 Ma to 12.8 ± 1.3 Ma - based on 17 recorded ages.
Synonyms of Gabbro
Other Language Names for Gabbro
Irish Gaelic:Gabró
Varieties of Gabbro
Allalin-gabbro | Variety 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 Associates
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 Group | ADSi2O6 |
3 photos of Gabbro associated with Quartz | SiO2 |
2 photos of Gabbro associated with Laumontite | CaAl2Si4O12 · 4H2O |
2 photos of Gabbro associated with Pyrite | FeS2 |
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 Calcite | CaCO3 |
1 photo of Gabbro associated with Chlorite Group | |
1 photo of Gabbro associated with Limonite |
Internet Links for Gabbro
mindat.org URL:
https://www.mindat.org/min-48275.html
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Nowa Ruda Massif, Gmina Nowa Ruda, KÅ‚odzko County, Lower Silesian Voivodeship, Poland