Dacite
A rock classification type
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About Dacite
Name:
After the ancient Roman province of Dacia (now part of Romania).
Dacitic rocks: fine-grained quartz and plagioclase dominant rocks, with felsics comprising >20% quartz and alkali feldspar/plagioclase <0.5.
A normally extrusive rock with a similar general composition to andesite, but having a more sodic plagioclase and more K-feldspar and quartz; it is the fine-grained equivalent of granodiorite.
Synonym: quartz andesite.
A normally extrusive rock with a similar general composition to andesite, but having a more sodic plagioclase and more K-feldspar and quartz; it is the fine-grained equivalent of granodiorite.
Synonym: quartz andesite.
Unique Identifiers
Mindat ID:
48447
Long-form identifier:
mindat:1:1:48447:5
Similar Names
| Davite | A synonym of Alunogen | |
| Pacite | A variety of Löllingite | FeAs2 |
Classification of Dacite
Dacite appears in fields 4 and 5 in the QAPF diagram.
Dacite is found in field 'O3' in the TAS diagram.
Sub-divisions of Dacite
Mineralogy of Dacite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Silica > Quartz | SiO2 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
| Pyroxene > Clinopyroxene > Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Pronunciation of Dacite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom | |
| Jolyon Ralph | United Kingdom |
Synonyms of Dacite
Other Language Names for Dacite
Common Associates
Associations Based on Photo Data:
| 5 photos of Dacite associated with Quartz | SiO2 |
| 4 photos of Dacite associated with Native Gold | Au |
| 4 photos of Dacite associated with Alunite | KAl3(SO4)2(OH)6 |
| 4 photos of Dacite associated with Calcite | CaCO3 |
| 4 photos of Dacite associated with Pyrite | FeS2 |
| 4 photos of Dacite associated with Trioctahedral mica | |
| 2 photos of Dacite associated with Famatinite | Cu3SbS4 |
| 1 photo of Dacite associated with Almandine | Fe2+3Al2(SiO4)3 |
| 1 photo of Dacite associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Internet Links for Dacite
mindat.org URL:
https://www.mindat.org/min-48447.html
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References for Dacite
Reference List:
Fort-de-France, Arrondissement of Fort-de-France, Martinique, France