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quartz andesite ancient Roman province of Dacia (now part of Romania)

A fine-grained extrusive rock with the same general composition as andesite, but having a less calcic plagioclase and more quartz; according to many, it is the extrusive equivalent of granodiorite.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
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