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Fine-grained ("volcanic") normal crystalline igneous rock

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About Fine-grained ("volcanic") normal crystalline igneous rockHide

Fine-grained ("volcanic") crystalline igneous rock that have mineral grains mostly <2mm, not readily identifiable to the naked eye. The subtypes usually must be petrographically and/or chemically analysed and plotted on QAPF or TAS diagrams to characterise them precisely.


Classification of Fine-grained ("volcanic") normal crystalline igneous rockHide

QAPF_V_.png

The QAPF diagram breaks fine-grained crystalline igneous rocks down into 15 groups.


1 Not Defined
2 Alkali-Feldspar Rhyolite
3 Rhyolite
4 Dacite
5 Plagidacite
6 Alkali-Feldspar Trachyte
6* Quartz-Bearing Alkali-Feldspar Trachyte
6' Foid-Bearing Alkali-Feldspar Trachyte
7 Trachyte
7* Quartz-Trachyte
7' Foid-Bearing Trachyte
8 Latite
8* Quartz-Latite
8' Foid-Bearing Latite
9 Andesite
9* Quartz-Bearing Andesite
9' Foid-Bearing Andesite
10 Basalt
10* Quartz-Bearing Basalt
10' Foid-Bearing Basalt
11 Phonolite
12 Tephritic Phonolite
13 Phonolitic Tephrite / Phonolitic Basanite
14 Tephrite / Basanite
15a Phonolitic Foidite
15b Tephritic Foidite
15c Foidite

TAS_.png

The TAS classification for fine-grained crystalline igneous rocks.






F Foidite
Pc Picrite
B Basalt
O1 Basaltic Andesite
O2 Andesite
O3 Dacite
R Rhyolite
U1 Tephrite, basanite
U2 Phonotephrite
U3 Tephryphonolite
Ph Phonolite
S1 Trachybasalt
S2 Basaltic Trachyandesite
S3 Trachyandesite
T Trachyte

Sub-divisions of Fine-grained ("volcanic") normal crystalline igneous rockHide

Synonyms of Fine-grained ("volcanic") normal crystalline igneous rockHide

Internet Links for Fine-grained ("volcanic") normal crystalline igneous rockHide

 
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