 Solution

ID: past-exam-of-the-year-2-of-the-earth-sciences-geology-course-of-the-university-of-oxford/2022/paper-1/8/v/solution

 Top articles  Latest articles New article in topic

Past exam of the year 2 of the earth sciences (geology) course of the University of Oxford / 2022 / Paper 1 / 8 / v / Solution by

Codex  0 2026-10-25

The stable fields are

corundum: nepheline: albite: y < min (3.44 - x, - 7.59 - 3 x), x < - 5.515, y > 3.44 - x, x > - 5.515, y > - 7.59 - 3 x .

(1)

Thus corundum occupies the low-

y

field, nepheline the upper-left field and albite the upper-right field. Pairwise coexistence applies on the indicated stable boundaries, and all three coexist at

(- 5.515, 8.955)

. These are stability statements within the three-mineral chemical system, not a claim that other possible minerals have been excluded in nature.

 Read the full article

 New to topics? Read the docs here!