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-Blue quartz grains showing a distinct color zoning; A -Albești, B -Rio delle Ossa, CLlano, D -Pietrosul Bistriței.

-Blue quartz grains showing a distinct color zoning; A -Albești, B -Rio delle Ossa, CLlano, D -Pietrosul Bistriței.

Source publication
Conference Paper
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Two blue quartz occurrences from Romania have been investigated using optical microscopy, XRD, FT-IR, TGA/DTA and SEM. The results produced are preliminary in nature and point to a coloration caused by the scattering of light by nano meter size, temperature sensitive inclusions.

Context in source publication

Context 1
... microscopic investigations have shown that the blue quartz grains of Albești and Pietrosul Bistriței are blue only in reflected light and brownish-yellow in transmitted light, just like the other studied blue quartz occurrences. The quartzes of Albești ( Figure 1) and Pietrosul Bistriței are blue and violet blue, respectively, have an opalescent appearance, more pronounced in the case of the Albești granite, and show a circular color zoning, more frequently in the case of the Albești quartz and also present in the Llano and Rio delle Ossa occurrences. Therefore, in the case of the Romanian occurrences (and Rio delle Ossa as well), it is possible to separate blue, less blue and even colorless zones within the same grain. ...

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