Which of the following options represent(s) simultaneous crystallization of two minerals in the given feature(s)?
Show Hint
- Granophyric texture
- Myrmekite
- Corona of orthopyroxene around anhedral olivine
- Cumulate pyroxene with interstitial plagioclase
The Correct Option is A, B
Solution and Explanation
Step 1: Recall the concept of simultaneous crystallization.
When two minerals crystallize together in mutual interference patterns or intergrowths, it indicates simultaneous crystallization from a melt.
Step 2: Check each option.
- (A) Granophyric texture: This is an intergrowth of quartz and feldspar with graphic or suture-like contacts, typical of simultaneous crystallization → Correct.
- (B) Myrmekite: Wormy intergrowth of quartz in plagioclase, formed due to reaction or simultaneous growth → Correct.
- (C) Corona of orthopyroxene around olivine: Represents a reaction rim texture, not simultaneous crystallization.
- (D) Cumulate pyroxene with interstitial plagioclase: Indicates sequential crystallization, not simultaneous.
Step 3: Conclusion.
The correct examples of simultaneous crystallization are (A) and (B).
Final Answer: \[ \boxed{\text{(A) Granophyric texture and (B) Myrmekite}} \]
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