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The Probert Encyclopaedia of Rocks & Minerals

PLAGIOCLASE

Picture of Plagioclase

Plagioclase has the formulae Na(AlSi3O8) and a relative hardness of 6. It is the plagioclase feldspar group includes: albite, oligoclase, andesine, labradorite, bytownite, anorthite.
Research Plagioclase

 
  
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