In Which of the Following Igneous Rocks and Environments Would

Multiple Choice

In which of the following igneous rocks and environments would you expect to find unusually high concentrations of rare elements such as lithium, beryllium, and boron?

A) pegmatite; crystallized from a water- rich, highly differentiated, residual magma
B) peridotite; crystallized at depth in the upper mantle
C) pumice lump; crystallized at depth in a mass of intrusive granite
D) basalt dike; fills a vertical fracture at shallow depth