THESE CAME DIRECT FROM THE MINE.ALL LISTED PRODUCTS/ELEMENTS ARE NATURAL EARTH GROWN. Users should refer to the original published version of the material for the full abstract. Posted about my SAB listing a few weeks ago about not showing up in search only when you entered the exact name. RARE & ONLY MINED IN LIMITED SUPPLY FROM ONE SOURCE IN AUSTRALIA. No warranty is given about the accuracy of the copy. However, users may print, download, or email articles for individual use. Copyright of Journal of Gemmology is the property of Gemmological Association of Great Britain and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. The rainbow lattice sunstone, an orthoclase from Australia Created: Sunday, 18 February 2018 21:45 Sunstone is well known by gemologists, especially the orange varieties from India and Tanzania, another source is Oregon in USA that produces a red sunstone.The Harts Range comprises a complex assemblage of granite gneiss, marble, calc-silicate, amphibolite, psammite and pelite that have been metamorphosed to upper amphibolite to granulite facies (Huston et al., 2006). The presence of magnetite is consistent with the black inclusions' attraction to a magnet, as well as testing with a vibrating sample magnetometer, which provided a ferromagnetic response. Rainbow lattice sunstone is found in the Harts Range, north-east from Alice Springs, Northern Territory, Australia. The geometric, iridescent lattice pattern changes as you roll the gem. Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) analysis of the magnetite showed that it is composed of very thin plates containing only Fe and O, without any Ti. A very rare stone, discovered in 1985 in a remote part of the desert in North Australia. The inclusions causing the aventurescence were identified as hematite, while lattice patterns were found to consist of orangey brown platelets of hematite and black platelets of magnetite (rather than ilmenite, as previously reported). Electron microprobe and X-ray diffraction (XRD) analysis, combined with laser Raman spectroscopy, indicate the host mineral is orthoclase (Or96Ab4), as previously reported in the literature. Abstract: Rainbow lattice sunstone from the Harts Range, Northern Territory, Australia, shows a rare combination of phenomena including aventurescence, adularescence and a distinctive lattice pattern caused by oriented inclusions.
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