List of top Geology and Geophysics Questions on Determinative mineralogy of common rock forming minerals

The following table provides the mineral chemistry of a garnet. All oxides are in weight percentage and cations in atoms per formula unit. Total oxygen is taken as 12 based on the ideal garnet formula. Consider Fe as Fetotal and Fe\(^{3+}\) = 0. The Xpyrope of this garnet is _.

Choose the correct option(s) that describe(s) the properties of clay minerals.

Choose the correct combination of minerals (listed in Group A) with the corresponding locations of their deposits (listed in Group B).

From the following optical properties of minerals, select an appropriate option to identify the direction of analyzer and polarizer if the available microscope is without a cross-hair.

The combinations listed below represent major minerals observed in four igneous rocks:
(i) Olivine and Anorthite, (ii) K-feldspar and Quartz, (iii) Mg-Ca-pyroxene and Ca-Na-plagioclase, (iv) Amphibole and Na-Ca-plagioclase
Arrange these mineral combinations based on decreasing temperature of magma crystallization.

Select the option that lists oxide minerals only.

The continuous series of Bowen’s reaction series is represented by

Which one of the following minerals has crystallographic axes \( a_1 = a_2 \neq c \) and all interaxial angles equal to 90°?