Mineralogical and Microstructural Features of Namibia Marbles: Insights about Tremolite Related to Natural Asbestos Occurrences
| Autor: | Claudia Ricchiuti, Marzia Rizzo, Rosalda Punturo, Elena Marrocchino |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
rhino white marble of Namibia
Greenschist Metamorphic rock Geochemistry Asbestiform 010501 environmental sciences 010502 geochemistry & geophysics medicine.disease_cause 01 natural sciences Asbestos Biomaterials Petrography Precambrian health hazard lcsh:TP890-933 lcsh:TP200-248 medicine lcsh:QH301-705.5 0105 earth and related environmental sciences Civil and Structural Engineering Mineral Fibrous habitus Health hazard Rhino white marble of Namibia Tremolite Ambientale lcsh:Chemicals: Manufacture use etc lcsh:QC1-999 tremolite lcsh:Biology (General) Mechanics of Materials Ceramics and Composites lcsh:Textile bleaching dyeing printing etc fibrous habitus rhino white marble of Namibia tremolite fibrous habitus health hazard lcsh:Physics Geology |
| Zdroj: | Fibers Volume 7 Issue 4 Fibers, Vol 7, Iss 4, p 31 (2019) |
| Popis: | The Mg-rich marbles of Precambrian rocks of Namibia are widely exploited and marketed abroad for ornamental purposes. Karibib marbles, named after the locality where the most important quarries are located, are commercially known as &ldquo White Rhino Marble&rdquo They formed under greenschist facies metamorphic conditions and may be characterized by the presence of veins of tremolite. Although the quarries, whose exploited marbles contain tremolite, do not seem to be abundant, we decided to carry out a detailed mineralogical and petrographic study on Karibib marbles in order to point out the occurrence of tremolite, whose shape may vary from prismatic to acicular, even sometimes resembling the asbestiform habitus and its geometry within the rock. With this aim, we carried out optical microscopy, X-ray diffractometry, X-ray scanning electron microscopy, and micro-Raman investigations, and also imaged the 3D fabric with micro computed X-ray tomography. The study of white marbles from Namibia and their mineral phases has an important impact, since tremolite might split into thin fibers and, therefore, being potentially harmful, the presence of tremolite requires an analysis of the risks of exposure to asbestos. |
| Databáze: | OpenAIRE |
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