Using X-rays to identify minerals on Mars

The Mars rover (Curiosity) is using X-rays to identify the elements in rocks on Mars according to a report in Universe Today.
"...uses X-ray diffraction, the standard practice for geologists on Earth using much larger laboratory instruments, and this is the first time this method has been used on another planet. It provides more accurate identifications of minerals than any method previously used on Mars. X-ray diffraction reads minerals’ internal structure by recording how their crystals distinctively interact with X-rays."

"We now know it is mineralogically similar to basaltic material, with significant amounts of feldspar, pyroxene and olivine, which was not unexpected. Roughly half the soil is non-crystalline material, such as volcanic glass or products from weathering of the glass."

Looks like a good item to use in class as an example of diffraction or use of X-rays.