![\"\"](\"https:\/\/stapelvanstenen.nl\/wp-content\/uploads\/2024\/10\/kiwi-jaspis-geanalyseerde-trommelsteen.jpg\")
<\/figure>\n\nAnalyzed tumblestone of “kiwi jasper,” the large gray-brown grains are quartz, but is the green amazonite and the darker grains tourmaline?<\/em><\/p>\n\n After my own investigation, I determined that it does indeed contain quartz<\/strong> (not the clear variety rock crystal, but more gray-brown quartz). The main mass is mostly white-gray (probably feldspar<\/strong>), with a slight green tinge here and there (this would have to be amazonite, a green feldspar). The darker grains referred to as tourmaline look under the microscope more like a micaceous mineral, such as muscovite<\/strong> or biotite<\/strong>. I could not come to an unambiguous conclusion myself, so in March 2021 a tumble stone of “Kiwi jasper” was analyzed by X-ray diffraction (XRD) in a laboratory in Germany. Herewith I am happy to share the results. <\/p>\n\n The white-gray main mass with light green tinge appears to consist of 3 minerals, namely 2 feldspars: albite<\/strong> and orthoclase<\/strong> and a mineral from the smectite group<\/strong> (topical name for montmorillionite group; also called “clay minerals”). Additional chemical analysis could provide further specification. However, NO amazonite<\/strong> (variety of microcline) was observed. Orthoclase is closely related to microcline, however, 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 micaceous group: muscovite<\/strong>. In addition, quartz<\/strong> has been identified. NO tourmaline <\/strong>was found in this stone. <\/p>\n\n graph of X-ray diffraction analysis (XRD) of ‘kiwi jasper’ in which the 5 constituents have been identified (muscovite, orthoclase, albite, montmorrilionite (smectite group) and quartz)<\/em><\/p>\n\n ‘Kiwi jasper’ is a rock (micro granite) composed of albite, orthoclase, a clay mineral, quartz and muscovite.<\/strong><\/p>\n\n I have found that many webshops and internet pages have copied the texts describing this stone from each other or from the source (a Dutch wholesaler). Better would be to replace the name ‘Kiwi jasper’ with ‘Kiwi stone<\/strong>‘ and adjust the composition based on the above analysis. In any case, mentioning the properties such as hardness, specific gravity and chemical composition of jasper with this rock composed of 5 other minerals is incorrect and misleading. <\/p>\n\n I have of course also informed the wholesaler of this material and the webshop where I bought it of these results. Adjustment of the name unfortunately seems unlikely. <\/p>\n\n If you also want to learn to better recognize minerals yourself based on their shape and characteristics follow a course<\/a> with me and watch my videos<\/a>.<\/p>\n\nLaboratory analysis<\/h2>\n\n
![\"\"](\"https:\/\/stapelvanstenen.nl\/wp-content\/uploads\/2024\/10\/XRD-kiwi-jaspis.jpg\")
<\/figure>\n\nSummary: ‘Kiwi jasper’ turns out to be granite<\/h2>\n\n
![\"kiwi](\"https:\/\/stapelvanstenen.nl\/wp-content\/uploads\/2024\/10\/k-kiwi-jaspis.jpg\")
<\/figure>\n\n