Question

The texture characterized by exsolved lamellae of albite in K-feldspar is known as

• A. myrmekite
• B. graphic
• C. perthite
• D. antiperthite

Hint:

Perthite is a texture found in K-feldspar where albite exsolution occurs, creating lamellae within the mineral.

Answer 1

The Correct Option is C

Step 1: Understanding the question.
The question asks about a specific texture in minerals characterized by the exsolution of albite in K-feldspar. This texture is typically referred to as perthite.

Step 2: Analyzing the options.
(A) myrmekite: Myrmekite is a texture where quartz forms intergrowths with feldspar, but not related to albite in K-feldspar.
(B) graphic: The graphic texture refers to the intergrowth of two minerals, commonly quartz and feldspar, but not exsolved albite.
(C) perthite: This is the correct answer. Perthite refers to a texture in K-feldspar where exsolved albite forms thin lamellae within the feldspar.
(D) antiperthite: Antiperthite is the opposite texture, where exsolved K-feldspar is present in albite.

Step 3: Conclusion.
The correct answer is (C) perthite because it specifically refers to the exsolution texture of albite in K-feldspar.