Plagioclase Feldspar

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Plagioclase feldspar.jpg
Plagioclase is a member of the feldspar mineral family. Plagioclase feldspars are a common silicate that contains considerable sodium or calcium. Feldspar crystals are stubby prisms, generally white to gray and a glassy luster. This variety of plagioclase, called albite, is rich in sodium.[1]

References

  1. http://wrgis.wr.usgs.gov/docs/parks/rxmin/mineral.html#amphibole
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