Question

Which ones of the following correspond to the Pyroxene group?

• A. $CaMgSi_2O_6$
• B. $CaAl_2SiO_6$
• C. $Ca_2Si_2O_6$
• D. $NaFeSi_2O_6$

Answer 1

The Correct Option is A, B, D

Identifying Pyroxene Group Members 

Step 1: Evaluating the Given Chemical Formulas

• (A) CaMgSi₂O₆: Correct. This corresponds to **Diopside**, which is a member of the **Pyroxene group**.
• (B) CaAl₂SiO₆: Correct. This corresponds to the **Pyroxene group**, known as **Wollastonite**.
• (C) Ca₂Si₂O₆: Incorrect. This is **not a Pyroxene mineral**, but rather a type of **feldspar**.
• (D) NaFeSi₂O₆: Correct. This corresponds to **Hedenbergite**, a member of the **Pyroxene group**.

Step 2: Selecting the Correct Answers

Based on the above analysis, the correct Pyroxene group members are:

\[ \mathbf{(A),\ (B),\ \text{and}\ (D)} \]

Final Answer:

Thus, the correct options are: (A), (B), and (D).