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The Probert Encyclopaedia of Rocks & Minerals

OLIGOCLASE

Picture of Oligoclase

Oligoclase has the formulae (Na,Ca)AlSi3O8 and a relative hardness of 7. It is a plagioclase feldspar. It is of interest to petrologists and collectors. Varieties: labradorite, anorthite.
Research Oligoclase

 
  
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