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AMETHYST CRYSTALS WITH CALCITE (PART OF A NATURAL GEODE) - Uruguay

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AMETHYST QUARTZ WITH CALCITE CRYSTAL

Part of a natural geode

Uruguay
   
In Rio Grand do Sul, the southernmost state of Brazil, and in adjacent Uruguay, quarries produce amethyst crystals that occur lining large hollow ‘geodes’.  These were formerly gas bubbles in 130 million year old basalt lava that now forms the giant Paraná lava plateau.
   
This is a lovely piece of amethyst of very good colour with a single crystal of calcite. The back shows basalt lava.
  
Please note:  The colour of amethyst has been known to gradually fade if exposed to bright light, and so exposure to direct sunlight is not recommended. However, If displayed in indirect, low-level lighting the colour will last a lifetime.  See the following article for more information:  
www.mindat.org/article.php/905/Amethyst+Specimens
   
Click on a picture for a larger image

Size:  13 x 6 x 6 centimetres
Weight:  505 grams

PRICE: £30.00