>  Term: rapakivi
rapakivi

A hornblende-biotite granite containing large rounded crystals of orthoclase mantled with oligoclase. The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks.

0 0

작성자

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 포인트
  • 100% positive feedback
© 2024 CSOFT International, Ltd.