When a shale metamorphoses into a slate why do some slates contain muscovite and some slates contain chlorite?
A) The chlorite slates form at different pressures than the muscovite slates.
B) The chlorite slates have a different composition than the muscovite slates.
C) The chlorite slates form at different temperatures than the muscovite slates.
D) The chlorite slates form at different temperatures and pressures than the muscovite slates.

Question

Quizplus · Accepted Answer

The presence of muscovite or chlorite in slates depends on the original composition of the shale that underwent metamorphism. Different minerals form from different precursor materials under similar conditions of pressure and temperature.

When a Shale Metamorphoses into a Slate Why Do Some