Retrieving "Polysynthetic Twinning" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Andesitic Rocks

   Linked via "polysynthetic twinning"

   Essential Minerals
   The essential mineral assemblage of andesitic rocks is defined by plagioclase feldspar, which usually dominates the groundmass. In andesites, the plagioclase is typically sodic to intermediate in composition (oligoclase to andesine), often exhibiting characteristic polysynthetic twinning visible under low magnification.
   Amphibole (hornblende)/) is a common mafic accessory, often lending a slight g…