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Which of the following is/are true for A...

Which of the following is/are true for Amphibole ?

A

In `Ca_(x) Mg_(y) [(Si_(4)O_(11))_(2)] (OH)_(2), x + y = 7`

B

In `Ca_(x) Mg_(y) [(Si_(4)O_(11))_(1)](OH)_(2), x + y = 6`

C

In `Na_(x)Fe_(y)^(II) Fe_(z)^(III) [(Si_(4)O_(11))_(2)] (OH)_(2), y + z - x = 3`
(The two iron in `+2` and `+3` oxidation state)

D

In `Na_(x) Fe_(y)^(II) Fe_(z)^(III) [(Si_(4)O_(11))_(2)] (OH)_(2) , y + z - x = 5`

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The correct Answer is:
A, C
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