Correlation between Colour and Fluorescence of Lapis lazuli
نویسنده
چکیده
Lapis lazuli is defined as a rock of varying composition. The following minerals have been identified in this rock by X-ray diffraction: lazurite, haüyne, sodalite, nosean, mica, diopside, wollastonite, calcite and pyrite. Among them the first two minerals, lazurite and haüyne, are responsible for the unique blue colour of massive lapis lazuli [1]. As it has been proved [2], the blue colour of lapis lazuli varies in hue and intensity according to the predominance of either lazurite or haüyne. The present note deals with the correlation between colour and fluorescence of different types of lapis lazuli.
منابع مشابه
On some Crystals of "Lapis Lazuli"
Due to its unique blue colour, lapis lazuli is used as an ornamental stone. Recently we obtained some dark blue 8 to 12 mm sized dodecahedral crystal from Afghanistan. Similar crystals have been described as crystals of lazurite [1]. The present investigation has been carried out in order to find the nature of these crystals. The colour of massive lapis lazuli is caused by lazurite and hauyne [...
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