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Basalt

A rock classification type
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About BasaltHide

A mafite or basaltoid containing mostly calcic plagioclase, clinopyroxene +/- olivine, orthopyroxene, foids, oxides and rarely quartz.

A general term for fine-grained, mafic (dark-colored) igneous rocks, commonly extrusive (volcanic) but locally intrusive (e.g., as dikes or pipes), composed chiefly of plagioclase and clinopyroxene; the fine-grained equivalent of gabbro. Olivine and iron-titanium oxides are very common and nepheline, orthopyroxene, or quartz may be present. Adj. basaltic.


Unique IdentifiersHide

Mindat ID:
48492
Long-form identifier:
mindat:1:1:48492:5
GUID
(UUID V4):
9e6faa20-1fbe-4fd3-b27f-33c8251af398

Classification of BasaltHide

QAPF_V_10,10star,10-.png

Basalt appears in fields 10,10* and 10’ in the QAPF diagram.

TAS_B.png

Basalt is found in field B in the TAS diagram.

Sub-divisions of BasaltHide

Mineralogy of BasaltHide

Essential minerals - these are minerals that are required within the classification of this rock:
Calcic plagioclaseA petrological term for plagioclase series feldspars dominant in calcium.
PyroxeneA petrological term for Pyroxene Group.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
OlivineCommonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ...
Silica > QuartzSiO2

Age distributionHide

Recorded ages:
Phanerozoic : 358.9 ± 0.4 Ma to Ma - based on 67 recorded ages.

Varieties of BasaltHide

AlbasaltAn obsolete name proposed for a basalt with excess alumina and alkalis.
BasaltineAn obsolete term for a porphyritic or fine-grained variety of basalt.

Common AssociatesHide

Associated Minerals Based on Photo Data:
29 photos of Basalt associated with CalciteCaCO3
26 photos of Basalt associated with Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
25 photos of Basalt associated with Apophyllite GroupAB4[Si8O22]X · 8H2O
19 photos of Basalt associated with Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
18 photos of Basalt associated with Heulandite Subgroup(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
18 photos of Basalt associated with CeladoniteK(MgFe3+â—»)(Si4O10)(OH)2
16 photos of Basalt associated with Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
16 photos of Basalt associated with CopperCu
15 photos of Basalt associated with Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
13 photos of Basalt associated with QuartzSiO2

Internet Links for BasaltHide

References for BasaltHide

 
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