Question

Which two minerals, not shown on the Graph of Changes in Mineral Composition Within the Palisades Sill,

are also likely to be found in some other samples of diabase?
(1) amphibole and potassium feldspar (3) quartz and biotite
(2) potassium feldspar and quartz (4) biotite and amphibole

Answer 1

(4) Biotite and amphibole were two minerals, not shown on the Graph of Changes in Mineral Composition Within the Palisades Sill, that are also likely to be found in some other samples of diabase.