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| The table below summarizes the mineralogy found by X-Ray Diffraction. Click on the sample link to see the diffractogram. These measurements were made and interpreted by Steve Sutley at the USGS Denver Federal Center. |
| Sample | Major Minerals | Minor Minerals | Trace Mineral | Possible Minerals | Notes |
| 1979 Hawaii 9 | Halloysite-7Å, syn - Al2Si2O5(OH)4 | Magnetite, syn - Fe2+Fe23+O4 | Hematite, syn - Fe2O3 | Minor amount of one or more of the spinel group minerals (magnetite, trevorite, chromite). Most likely magnetite due to magnetic properties. Trace to minor hematite. Major amounts of amorphous materials. | |
| 1979 Hawaii 4 | Halloysite-7Å, syn - Al2Si2O5(OH)4 Magnetite, syn - Fe2+Fe23+O4 |
Hematite, syn - Fe2O3 | Trevorite, syn - NiFe2O4 Chromite, syn - Fe2+Cr2O4 Magnesioferrite, syn ordered - MgFe23+O4 |
Major amorphous material. May be more one spinel group mineral. Need chemistry. | |
| South Pu'u Kilohana | Anorthite, syn sodian, intermediate- (Ca,Na)(Si,Al)4O8 | Maghemite-C, syn - Fe2O3 Magnetite, syn - Fe2+Fe23+O4 Hematite, syn - Fe2O3 |
Cristobalite, syn - SiO2 Augite, syn - Ca(Mg,Fe)Si2O6 |
Have magnetite and/or maghemite. Probable trace to minor cristobalite. | |
| Puu Nene Horizon D | Anorthite, syn sodian, intermediate- (Ca,Na)(Si,Al)4O8 Albite, syn disordered - Na(Si3Al)O8 |
Magnetite, syn - Fe2+Fe23+O4 Forsterite, ferroan, syn- (Mg,Fe)2SiO4 |
Cristobalite, syn - SiO2 | Plagioclase is albite and/or anorthite. Spinel group mineral may be franklinite and/or magnetite (need chemistry). Most likely magnetite due to its magnetic properties. Possible trace cristobalite. | |
| JSC-1 | Anorthite, syn sodian, intermediate- (Ca,Na)(Si,Al)4O8 Albite, syn disordered - Na(Si3Al)O8 |
Magnetite, syn - Fe2+Fe23+O4 Forsterite, ferroan, syn- (Mg,Fe)2SiO4 |
Cristobalite, syn - SiO2 | Plagioclase is albite and/or anorthite. Spinel group mineral may be franklinite and/or magnetite (need chemistry). Most likely magnetite due to its magnetic properties. Possible trace cristobalite. Minor to major amorphous material. | |
| Hematite | Hematite, syn - Fe2O3 Maghemite-Q, syn - Fe2O3 |
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| Hematite Orenburg | Hematite, syn - Fe2O3 | Goethite, syn - Fe3+O(OH) Quartz, syn - SiO2 Calcite, syn - CaCO3 |
Possible trace calcite | ||
| Grey Hematite - Michgan | Hematite, syn - Fe2O3 | Goethite, syn - Fe3+O(OH) | Small amount of poorly crystallized goethite | ||
| Grey Hematite - Mexico | Hematite, syn - Fe2O3 | Goethite, syn - Fe3+O(OH) | Magnetite, syn - Fe2+Fe23+O4 | Minor to major amorphous material. Possible trace magnetite. | |
| Magnetite | Maghemite-Q, syn - Fe2O3 |
Hematite, syn - Fe2O3 Quartz, syn - SiO2 |
Magnetite and/or magnesoiferrite (need chemistry). Most likely magnetite due to its magnetic properties. | ||
| Goethite | Goethite, syn - Fe3+O(OH) Siderite, syn - FeCO3 |
Groutite, syn - Mn3+O(OH) | Minor to major amorphous material. Possible trace groutite (need chemistry). | ||
| Jarosite | Natrojarosite, syn - NaFe3(SO4)2(OH)6 | Jarosite, syn - KFe3(SO4)2(OH)6 |
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