Pub Date : 2022-01-01DOI: 10.15506/jog.2021.38.1.3b
Carol M. Stockton
{"title":"Webinars and Other Online Gemmological Education","authors":"Carol M. Stockton","doi":"10.15506/jog.2021.38.1.3b","DOIUrl":"https://doi.org/10.15506/jog.2021.38.1.3b","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67234674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2021.38.1.64
J. Zwaan
: Demantoid garnets from Antetezambato, northern Madagascar, contain a characteristic inclusion suite typical of a skarn occurrence. Unlike demantoid from the classic deposits in the Ural Mountains, Russia, and from other serpentinite-related occurrences, the stones from Madagascar do not contain ‘horsetail’ inclusions, but instead host groups of small, rounded diopside grains, fluorapatite, dolomite, calcite, quartz, pyrite and wollastonite, as well as rare native bismuth. Partially healed fissures contain two-phase fluid inclusions (with H 2 O and a gas bubble) of varying salinity. Negative crystals, commonly large and empty, sometimes also contain H 2 O. Pronounced growth features and parallel hollow tubes are also present. Demantoid from Namibia likewise has a skarn origin and shows some similar internal features, as well as some that are different, such as the common presence of fluorapatite and small multiphase fluid inclusions, along with the absence of large negative crystals and native bismuth. A review of previously advocated methods for geographic origin determination of demantoid based on chemical fingerprinting alone shows that this technique is applicable only to stones with a nearly pure andradite composition when differentiating Malagasy and Namibian localities. In such cases, elevated traces of Mn are indicative of a Namibian origin.
{"title":"Demantoid Garnet from Antetezambato, Northern Madagascar—Internal Characteristics and Their Use in Deciphering Geographic Origin","authors":"J. Zwaan","doi":"10.15506/jog.2021.38.1.64","DOIUrl":"https://doi.org/10.15506/jog.2021.38.1.64","url":null,"abstract":": Demantoid garnets from Antetezambato, northern Madagascar, contain a characteristic inclusion suite typical of a skarn occurrence. Unlike demantoid from the classic deposits in the Ural Mountains, Russia, and from other serpentinite-related occurrences, the stones from Madagascar do not contain ‘horsetail’ inclusions, but instead host groups of small, rounded diopside grains, fluorapatite, dolomite, calcite, quartz, pyrite and wollastonite, as well as rare native bismuth. Partially healed fissures contain two-phase fluid inclusions (with H 2 O and a gas bubble) of varying salinity. Negative crystals, commonly large and empty, sometimes also contain H 2 O. Pronounced growth features and parallel hollow tubes are also present. Demantoid from Namibia likewise has a skarn origin and shows some similar internal features, as well as some that are different, such as the common presence of fluorapatite and small multiphase fluid inclusions, along with the absence of large negative crystals and native bismuth. A review of previously advocated methods for geographic origin determination of demantoid based on chemical fingerprinting alone shows that this technique is applicable only to stones with a nearly pure andradite composition when differentiating Malagasy and Namibian localities. In such cases, elevated traces of Mn are indicative of a Namibian origin.","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67235004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2022.38.3.214d
Carol M. Stockton
{"title":"World Silver Survey 2022","authors":"Carol M. Stockton","doi":"10.15506/jog.2022.38.3.214d","DOIUrl":"https://doi.org/10.15506/jog.2022.38.3.214d","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67235296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2022.38.4.308b
Carol M. Stockton
{"title":"Assure Program Developments","authors":"Carol M. Stockton","doi":"10.15506/jog.2022.38.4.308b","DOIUrl":"https://doi.org/10.15506/jog.2022.38.4.308b","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67236998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2022.38.4.405
L. Kiefert
{"title":"Jade: A Gemologist’s Guide","authors":"L. Kiefert","doi":"10.15506/jog.2022.38.4.405","DOIUrl":"https://doi.org/10.15506/jog.2022.38.4.405","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67237817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2022.38.4.364
I. Pignatelli, C. Morlot, G. Giuliani, V. Pardieu
{"title":"The ‘Star of David’ Pattern and Presence of Macrosteps on Ruby and Sapphire Crystals from Aappaluttoq, Greenland","authors":"I. Pignatelli, C. Morlot, G. Giuliani, V. Pardieu","doi":"10.15506/jog.2022.38.4.364","DOIUrl":"https://doi.org/10.15506/jog.2022.38.4.364","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67237952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2021.38.1.1
Carol M. Stockton
{"title":"Inspectrum Spectrometer","authors":"Carol M. Stockton","doi":"10.15506/jog.2021.38.1.1","DOIUrl":"https://doi.org/10.15506/jog.2021.38.1.1","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67233730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2021.38.1.100
Rolf Tatje
{"title":"Diamonds: Their History, Sources, Qualities and Benefits","authors":"Rolf Tatje","doi":"10.15506/jog.2021.38.1.100","DOIUrl":"https://doi.org/10.15506/jog.2021.38.1.100","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"71 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67233816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2022.38.3.214a
Carol M. Stockton
{"title":"Lab-Grown Diamond Consumer Segments","authors":"Carol M. Stockton","doi":"10.15506/jog.2022.38.3.214a","DOIUrl":"https://doi.org/10.15506/jog.2022.38.3.214a","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67235182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.15506/jog.2022.38.3.214
Carol M. Stockton
{"title":"JNA’s Lab-Grown Diamond Special Issue","authors":"Carol M. Stockton","doi":"10.15506/jog.2022.38.3.214","DOIUrl":"https://doi.org/10.15506/jog.2022.38.3.214","url":null,"abstract":"","PeriodicalId":48560,"journal":{"name":"Journal of Gemmology","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67235605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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