Recently I had some tumbled stones with fancy names analyzed because I had doubts about their exact composition and "Kiwi jasper" was one of them.

That "Kiwi jasper" is not jasper at all is well known to many by now. But what is it? It is indicated by most vendors that the stone is made up of amazonite, tourmaline and rock crystal / quartz.

After my own research, I determined that it does indeed contain quartz (not the clear variety of rock crystal) and a white-gray main mass (probably feldspar) with a slight green tinge here and there (this would have to be the amazonite). The darker grains referred to as tourmaline look under the microscope more like a mica mineral such as muscovite or biotite. I could not come to an unequivocal conclusion myself, so a tumbled stone of "Kiwi jasper" was recently analyzed by X-ray diffraction (XRD) in a laboratory in Germany. I hereby happily share the results to contribute to mindat:

The white-gray main mass with slight green tinge appears to consist of 3 minerals, namely 2 feldspars: albite and orthoclase and a mineral from the smectite group (current name for montmorillionite group). Additional chemical analysis could provide further specification. However, no amazonite or microcline was observed. Orthoclase however is of course closely related to microcline, and MinDat teaches us that the designation amazonite is used 'overenthusiastically' for greenish feldspars including orthoclase. The dark grains have indeed been analyzed as a mineral from the mica group: muscovite. In addition, quartz has been found. no tourmaline was found in this stone.

In summary, "Kiwi jasper" is a rock (most likely a micro granite) consisting of albite, orthoclase, a mineral from the smectite group, quartz and muscovite.

Is this something you would like to add to Mindat? I can provide the XRD graphs co course.