Journal of The Gemmological Society of Japan
Online ISSN : 2189-8413
Print ISSN : 0385-5090
ISSN-L : 0385-5090
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Volume 32, Issue 1-4
Displaying 1-29 of 29 articles from this issue
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Articles
  • Mineralogical characteristics of jadeites in some localities of the world
    Masahiko Hayashi, Ｍａｓａｎｏｂｕ Ｓａｋａｍｉ, Mana Yasui, Atsushi Yamazaki, Sadao ...
    2016 Volume 32 Issue 1-4 Pages 3-16
    Published: April 30, 2016
    Released on J-STAGE: January 16, 2017
    DOIhttps://doi.org/10.14915/gsjapan.32.1-4_3
    JOURNAL FREE ACCESS
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    Jadeite or “Jade” used as a necklace since six thousand years ago around called Jomon Period is thought to have been taken around Himekawa, Kotaki and Ohmi in Niigata, Japan. Furthermore, jadeite has been also reported from metamorphic rocks at Wakasa of Tottori Pref., Ohsa of Okayama Pref., Ohya of Hyogo Pref., Nishisonogi of Nagasaki Pref. and the other several localities in Japan. On the other hand, jadeite from Yorii of Saitama Pref. and Shimonita of Gunma Prefecture in Japan are not introduced in this report due to showing a visible coarse grain gap in each of the crystal and not suitable for polishing. The foreign jadeites from Myanmar, USA, Guatemala, Russia and the other several countries are known. The results of examining the obtained samples show that most samples were jadeite but some local samples should be called as omphacite, according to nomenclature of pyroxene group minerals (Morimoto et al., 1988).
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  • Distribution of type IaA, IaB and IIa zones in natural diamond found with cathodoluminescence spectroscopy and topography
    Hisao Kanda
    2016 Volume 32 Issue 1-4 Pages 17-32
    Published: April 30, 2016
    Released on J-STAGE: January 16, 2017
    DOIhttps://doi.org/10.14915/gsjapan.32.1-4_17
    JOURNAL FREE ACCESS
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    Cathodoluminescence( CL ) spectroscopy and topography have been investigated to classify local points of natural diamond crystals to type IaA, IaB and IIa, and each type shows its specific nature in CL spectra as follows:
    Type IaA exhibits the N9 center and broad band with maximum around 420 nm,
    Type IaB does the K, L, M, T emission and the N3 center,
    Type IIa does the free exciton system and 430 nm Band-A.
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Short Notes
Abstracts of Papers Presented at 2015 Annual Meeting of the Society Held in Kofu on June 27,2015
Special Lecture
Lecture
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