New studies done on OJ at mindat
Feb 19, 2020 20:50:19 GMT -5
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Post by rockjunquie on Feb 19, 2020 20:50:19 GMT -5
www.mindat.org/a/characterization_studies_of_ocean_jasper
1dave- you will like this.
In this article I present the first known compositional (SEM/EDS) and crystallographic (XRD) characterization studies for 7 specimens of old stock Ocean Jasper. I provide an analysis of the results and I identify a series of next-step characterization tests.
Ocean Jasper is a rare orbicular rock uniquely from Madagascar, classified as a “spherulitic chalcedony”. The rarer high-grade varieties are “old stock”, mined between 2001-2006, mines depleted and no publicly known similar quality veins found since. Feature descriptions, grade classifications, large-format specimen photos, and an extensive discussion of geological information and possible formation are discussed in [1].
Compositional tests reported in this article were done by qualitative energy dispersive x-ray spectroscopy (EDS) via scanning electron microscopy (SEM) using a Cambridge S100 SEM, a XR-100-CR pin diode detector and DTSA software, 25 Kev accelerating voltage [2]. Crystallography tests reported were done by powder x-ray diffraction (XRD) using standard copper Kα radiation diffractometry [3].
Ocean Jasper is a rare orbicular rock uniquely from Madagascar, classified as a “spherulitic chalcedony”. The rarer high-grade varieties are “old stock”, mined between 2001-2006, mines depleted and no publicly known similar quality veins found since. Feature descriptions, grade classifications, large-format specimen photos, and an extensive discussion of geological information and possible formation are discussed in [1].
Compositional tests reported in this article were done by qualitative energy dispersive x-ray spectroscopy (EDS) via scanning electron microscopy (SEM) using a Cambridge S100 SEM, a XR-100-CR pin diode detector and DTSA software, 25 Kev accelerating voltage [2]. Crystallography tests reported were done by powder x-ray diffraction (XRD) using standard copper Kα radiation diffractometry [3].
1dave- you will like this.
