Paragenetic Mode 20 : Acidic volcanic rocks
Return to the list of paragentic modesDescription
Rhyolite, dacite, and other quartz- and alkali feldspar-bearing volcanic rocks played an important role in the evolution of continental crust.Stage
| Stage 4a: Earth’s earliest continental crust - Age: >4.4-3.0 Ga |
|---|
| 19 : Granitic intrusive rocks |
| 20 : Acidic volcanic rocks |
Minerals
Click on a button to filter by elements. Green = must include. Black = must exclude. Mineral names listed in bold are exclusively known from this paragenetic mode.
| Mineral | Formula | Crystal System |
|---|---|---|
| Aenigmatite | Na4[Fe2+10Ti2]O4[Si12O36] | Triclinic |
| Anhydrite | CaSO4 | Orthorhombic |
| Annite | KFe2+3(AlSi3O10)(OH)2 | Monoclinic |
| Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Monoclinic |
| Baryte | BaSO4 | Orthorhombic |
| Bergslagite | CaBeAsO4(OH) | Monoclinic |
| Beryl | Be3Al2(Si6O18) | Hexagonal |
| Clinoferrosilite | Fe2+2Si2O6 | Monoclinic |
| Cristobalite | SiO2 | Tetragonal |
| Cummingtonite | ◻{Mg2}{Mg5}(Si8O22)(OH)2 | Monoclinic |
| Diopside | CaMgSi2O6 | Monoclinic |
| Durangite | NaAl(AsO4)F | Monoclinic |
| Edenite | NaCa2Mg5(Si7Al)O22(OH)2 | Monoclinic |
| Ferro-edenite | NaCa2Fe2+5(Si7Al)O22(OH)2 | Monoclinic |
| Ferro-hornblende | ◻Ca2(Fe2+4Al)(Si7Al)O22(OH)2 | Monoclinic |
| Ferro-tschermakite | ◻{Ca2}{Fe2+3Al2}(Al2Si6O22)(OH)2 | Monoclinic |
| Ferrosilite | Fe2+2Si2O6 | Orthorhombic |
| Fluor-buergerite | NaFe3+3Al6(Si6O18)(BO3)3O3F | Trigonal |
| Fluorannite | KFe2+3(Si3Al)O10F2 | Monoclinic |
| Fluorapophyllite-(NH₄) | NH4Ca4(Si8O20)F·8H2O | Tetragonal |
| Fluoro-edenite | NaCa2Mg5(Si7Al)O22F2 | Monoclinic |
| Fluoro-pargasite | NaCa2(Mg4Al)(Si6Al2)O22F2 | Monoclinic |
| Forsterite | Mg2SiO4 | Orthorhombic |
| Hastingsite | NaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2 | Monoclinic |
| Magnesio-fluoro-hastingsite | NaCa2(Mg4Fe3+)(Si6Al2)O22F2 | Monoclinic |
| Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 | Monoclinic |
| Magnetite | Fe2+Fe3+2O4 | Isometric |
| Maxwellite | NaFe3+(AsO4)F | Monoclinic |
| Meifuite | KFe6(Si7Al)O19(OH)4Cl2 | Triclinic |
| Mogánite | SiO2 | Monoclinic |
| Montdorite | (K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4 | Monoclinic |
| Muscovite | KAl2(AlSi3O10)(OH)2 | Monoclinic |
| Osumilite | K◻2Fe2+2Al3[Al2Si10O30] | Hexagonal |
| Osumilite-(Mg) | K◻2Mg2Al3[Al2Si10O30] | Hexagonal |
| Pargasite | NaCa2(Mg4Al)(Si6Al2)O22(OH)2 | Monoclinic |
| Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) | Monoclinic |
| Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Monoclinic |
| Rasvumite | KFe2S3 | Orthorhombic |
| Sanidine | K(AlSi3O8) | Monoclinic |
| Siderophyllite | KFe2+2Al(Al2Si2O10)(OH)2 | Monoclinic |
| Spessartine | Mn2+3Al2(SiO4)3 | Isometric |
| Tetraferriannite | KFe2+3(Si3Fe3+)O10(OH)2 | Monoclinic |
| Tilasite | CaMg(AsO4)F | Monoclinic |
| Topaz | Al2(SiO4)(F,OH)2 | Orthorhombic |
| Tridymite | SiO2 | Triclinic |
| Element | Count | Percent | |
|---|---|---|---|
| H | Hydrogen | 18 | 40.00% |
| Be | Beryllium | 2 | 4.44% |
| B | Boron | 1 | 2.22% |
| N | Nitrogen | 1 | 2.22% |
| O | Oxygen | 44 | 97.78% |
| F | Fluorine | 11 | 24.44% |
| Na | Sodium | 12 | 26.67% |
| Mg | Magnesium | 14 | 31.11% |
| Al | Aluminium | 24 | 53.33% |
| Si | Silicon | 37 | 82.22% |
| S | Sulfur | 3 | 6.67% |
| Cl | Chlorine | 1 | 2.22% |
| K | Potassium | 11 | 24.44% |
| Ca | Calcium | 18 | 40.00% |
| Ti | Titanium | 1 | 2.22% |
| Mn | Manganese | 3 | 6.67% |
| Fe | Iron | 21 | 46.67% |
| As | Arsenic | 4 | 8.89% |
| Ba | Barium | 1 | 2.22% |
References
Hazen, Robert M., Morrison, Shaunna M. (2022) On the paragenetic modes of minerals: A mineral evolution perspective. American Mineralogist, 107 (7) 1262-1287 doi:10.2138/am-2022-8099
