Paragenetic Mode 4 : Primary chondrule phases
Return to the list of paragentic modesDescription
Overlapping pulses of nebular mineralization are preserved as the primary igneous minerals of chondrules, which represent solidified droplets, typically <0.1 cm diameter, that formed during the first few million years of the solar nebula, ~4.566 to 4.561 Ga.
Age: 4.566–4.561 GaStage
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 |
|---|
| Alabandite | MnS | Isometric |
| Albite | Na(AlSi3O8) | Triclinic |
| Anorthite | Ca(Al2Si2O8) | Triclinic |
| Armalcolite | (Mg,Fe2+)Ti2O5 | Orthorhombic |
| Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Monoclinic |
| Awaruite | Ni3Fe | Isometric |
| Caswellsilverite | NaCrS2 | Trigonal |
| Chromite | Fe2+Cr3+2O4 | Isometric |
| Clinoenstatite | MgSiO3 | Monoclinic |
| Cohenite | Fe3C | Orthorhombic |
| Cristobalite | SiO2 | Tetragonal |
| Daubréelite | Fe2+Cr3+2S4 | Isometric |
| Enstatite | Mg2Si2O6 | Orthorhombic |
| Forsterite | Mg2SiO4 | Orthorhombic |
| Graphite | C | Hexagonal |
| Grossmanite | CaTi3+ AlSiO6 | Monoclinic |
| Haxonite | (Fe,Ni)23C6 | Isometric |
| Ilmenite | Fe2+TiO3 | Trigonal |
| Iron | Fe | Isometric |
| Keilite | (Fe2+,Mg)S | Isometric |
| Kumdykolite | Na(AlSi3O8) | Orthorhombic |
| Magnetite | Fe2+Fe3+2O4 | Isometric |
| Merrihueite | K(◻Na)Fe2+2Fe2+3[Si12O30] | Hexagonal |
| Merrillite | Ca9NaMg(PO4)7 | Trigonal |
| Nazarovite | Ni12P5 | Tetragonal |
| Nepheline | Na3K(Al4Si4O16) | Hexagonal |
| Nickelphosphide | (Ni,Fe)3P | Tetragonal |
| Niningerite | (Mg,Fe2+,Mn2+)S | Isometric |
| Oldhamite | (Ca,Mg)S | Isometric |
| Pentlandite | (NixFey)Σ9S8 | Isometric |
| Perovskite | CaTiO3 | Orthorhombic |
| Perryite | (Ni,Fe)5(Si,P)2 | Trigonal |
| Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Monoclinic |
| Roedderite | K(◻Na)Mg2Mg3[Si12O30] | Hexagonal |
| Rutile | TiO2 | Tetragonal |
| Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] | Monoclinic |
| Schreibersite | (Fe,Ni)3P | Tetragonal |
| Sinoite | Si2N2O | Orthorhombic |
| Sphalerite | ZnS | Isometric |
| Spinel | MgAl2O4 | Isometric |
| Taenite | (Fe,Ni) | Isometric |
| Tetrataenite | FeNi | Tetragonal |
| Tridymite | SiO2 | Triclinic |
| Troilite | FeS | Hexagonal |
| Wassonite | TiS | Trigonal |
| Zirconolite | CaZrTi2O7 | Orthorhombic |
| Element | Count | Percent |
|---|
| C | Carbon | 3 | 6.52% |
| N | Nitrogen | 1 | 2.17% |
| O | Oxygen | 25 | 54.35% |
| Na | Sodium | 7 | 15.22% |
| Mg | Magnesium | 13 | 28.26% |
| Al | Aluminium | 7 | 15.22% |
| Si | Silicon | 17 | 36.96% |
| P | Phosphorus | 5 | 10.87% |
| S | Sulfur | 10 | 21.74% |
| K | Potassium | 3 | 6.52% |
| Ca | Calcium | 8 | 17.39% |
| Ti | Titanium | 7 | 15.22% |
| Cr | Chromium | 3 | 6.52% |
| Mn | Manganese | 2 | 4.35% |
| Fe | Iron | 21 | 45.65% |
| Ni | Nickel | 9 | 19.57% |
| Zn | Zinc | 1 | 2.17% |
| Zr | Zirconium | 1 | 2.17% |
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
