Question

Which of the following statement(s) is/are CORRECT regarding ophitic texture?

• A. Plagioclase laths are completely enclosed by large pyroxene crystals.
• B. Intergrowth occurs between quartz and alkali-feldspar.
• C. It is a variety of poikilitic texture.
• D. It is a texture observed in peridotite.

Hint:

Ophitic texture = Plagioclase enclosed in Pyroxene.
Graphic texture = Quartz intergrowth with Feldspar.

Answer 1

The Correct Option is A, C

Step 1: Defining ophitic texture.
Ophitic texture is a common igneous texture found in dolerites and gabbros, where plagioclase laths are enclosed by larger pyroxene crystals.
Step 2: Evaluating statements.
(A) Correct — Plagioclase is enclosed by pyroxene (typical ophitic structure).
(B) Incorrect — That describes graphic intergrowth, not ophitic texture.
(C) Correct — Ophitic texture is a variety of poikilitic texture.
(D) Incorrect — Peridotite typically shows granular or cumulus textures, not ophitic.
Step 3: Conclusion.
Hence, the correct statements are (A) and (C).