X-Ray Diffraction (XRD) Analysis

Quantitative chemical analysis of a rock, soil, metal or effluent to a high degree of accuracy and cost effectiveness. For geological applications such as rock and clay mineral mineralogical analysis, as well as forensic, environmental and engineering projects.

More mineral analyses are available at our minerals laboratory.


  • Qualitative Analysis. In addition to identification of crystalline material we can also identify the presence of X-ray amorphous material.
  • Quantitative Analysis. We use the quantitative interpretive software ‘Siroquant’ to determine the relative abundance of major crystalline phases and to some extent amorphous phases within your sample. Please note that this method is not appropriate for determining trace mineral composition.
  • Clay Mineral Analyses. Identification of clay minerals such as kaolinite, chlorite, smectite and illite is done from the <2μm size fraction. The clay mineral separate is prepared in our laboratory from the sample provided. Glycolation and two heating steps (450oC and 550oC) can be performed if requested. If present, it may be possible to determine the ratio of mixed clay illite-smectite.

Please contact us for a quote.

Turnaround Times
Usually 15 working days.
Priority service is available on request. 5 day:1.5 x standard rate; 3 day: 2 x standard rate; 1 day: 3 x standard rate.

Sample Submission
Please contact us for specific details on how to submit your samples.

All parcels containing samples of non-New Zealand origin MUST be accompanied by a MPI import permit, and have the permit number written on the outside of the package.

Sample required

  • Qualitative analysis - approximately 1g of sample is sufficient. In the case of well-crystalline, single grain, about 1 mg of material is all that is required using our special low background silicon sample holders.
  • Quantitative analysis - can be done on very small sample sizes, but a minimum of 5g would be preferred.
  • Bulk sample analysis - where clay fraction is to be extracted, we require preferably more than 10g of sample. If clay fraction is to be supplied then approximately 400 mg of sample is required.

Courier samples to:

GNS Science
New Zealand Geothermal Analytical Laboratory
114 Karetoto Rd
SH1 Wairakei
New Zealand 3384