Question

Match the following igneous textures in Group-I with their definitions in Group-II.

• A. P-2; Q-3; R-4; S-1
• B. P-3; Q-4; R-2; S-1
• C. P-4; Q-1; R-2; S-3
• D. P-4; Q-1; R-3; S-2

Hint:

When identifying igneous textures, note the key features such as the arrangement of crystals, their sizes, and the presence of specific minerals like feldspar or pyroxene.

Answer 1

The Correct Option is C

Let’s match the igneous textures with their respective definitions:
- P. Vitrophyre: This texture is characterized by large phenocrysts within a glassy matrix, so it matches with option (4).
- Q. Rapakivi: This texture is defined as the presence of alkali feldspar rimmed by plagioclase, so it matches with option (1).
- R. Ocelli: Ocelli are typically sub-parallel skeletal, platy olivine, and/or pyroxene, so it matches with option (2).
- S. Spinifex: This texture consists of an aggregate of radially arrayed, needle-like crystals of plagioclase with or without clinopyroxene, so it matches with option (3).
Thus, the correct match is (C) P-4; Q-1; R-2; S-3.