The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary

The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.

 
       
         
    STUDIA GEOLOGIA - Issue no. Special Issue / 2009  
         
  Article:   THE “CHALCEDONY” OF TRESTIA, MARAMUREŞ (ROMANIA) – REVISITED.

Authors:  GHEORGHE ILINCA, CORINA IONESCU, LUCREŢIA GHERGARI.
 
       
         
  Abstract:  Ever since its first documentary mention by Benkö (1786), the famous blue silica from Trestia, Maramureş (Romania) has been a subject of lively debate and controversy, especially in what concerned: 1) its source and host rock, 2) the origin of its cubic crystals, and 3) the origin of its characteristic blue color. In view of this historic discussion, it is no wonder that the occurrence from Trestia has been quoted under many names: saphirine, lussatite, cubosilicite, chalcedonite, chalcedony, quartzine, opal, agate etc., even though it consists almost exclusively of quartz with variable crystal size (Fig. 1). Submicroscopic traces of CT-opal are present as well. The paper reviews the main issues of controversy following the paper by Benkö and adds new mineralogical insights.

Key words: blue “chalcedony”, crystallographic forms, color, Trestia, Maramureş, Romania
 
         
     
         
         
      Back to previous page