XRD Characterization


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-7, 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-7, 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 
       
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