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Dacite

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Name:
After the ancient Roman province of Dacia (now part of Romania).
Dacitic rocks with felsics comprising >20% quartz and alkali feldspar/plagioclase <0.5.
A fine-grained extrusive rock with a similar general composition to andesite, but having a more sodic plagioclase and more K-feldspar and quartz; it is the extrusive equivalent of granodiorite.

Synonym: quartz andesite.


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Classification of DaciteHide

QAPF_V_4,5.png

Dacite appears in fields 4 and 5 in the QAPF diagram.

TAS_O3.png

Dacite is found in field 'O3' in the TAS diagram.

Sub-divisions of DaciteHide

Mineralogy of DaciteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Pyroxene > Clinopyroxene > Augite(CaxMgyFez)(Mgy1Fez1)Si2O6

Internet Links for DaciteHide

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