Figure 4. above shows the XRD data of grossular, acquired from the RRUFF data base as well as the XRD results from the given mineral. Like the RAMAN data, the red line represents the test results from the given mineral and the yellow line represents the RAMAN data of a grossular mineral. Again in the XRD like the RAMAN, the shape and alignment of the two graphs are similar, but the mystery mineral is slightly shifted. The highest peaks are at the same 2θ values and are labeled with the indicated lattice planes ([400], [420], [611], [640], [642]). Within the XRD, X-rays are emitted from the cathode ray tube sending electrons to the target material. When the X-ray hits a crystal lattice, scattering will occur. Most scattering will cancel each other out, but when diffraction occurs because of the crystal structure of each mineral, the diffraction will send off the X-ray in a unique way. We can than take the Bragg's Law equation (\(2dsin(\Theta )=\lambda _{o}\)) and use the unique pattern to determine each mineral Carrara 1984. The XRD will continue to record the intensity of the diffracted x-rays as the sample is rotated within the machine. A peak in intensity will occur when the mineral contains lattice planes with d-spacings appropriate to diffract X-rays at that value of θ, in the case of grossular, this happened at the  lattice planes [400], [420], [611], [640], and [642]. When atoms are arranged in a specific pattern such as in crystals, the diffracted waves will be sharp, allowing for the deduction of distribution of atoms at those lattice planes. When comparing the two graphs, the mystery mineral sample is slightly unaligned from the grossular data. This indicates that the mystery mineral is in fact not a pure grossular, but most likely a solid solution with a Ca and either Mg, Fe, or Mn in the X divalent cation region.