Retrieving "Bytownite" from the archives

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1. Tholeiite

   Linked via "bytownite"

   The characteristic mineralogy of tholeiitic rock suites reflects crystallization under relatively low confining pressure and high oxygen fugacity relative to alkaline basalts. The principal minerals observed in typical tholeiitic groundmasses are:
   Plagioclase Feldspar: Typically ranging from labradorite to bytownite, exhibiting strong normal zoning towards more so…