[AFMC 2004]
A) $ Ca[B_3O_4{{(OH)}_2}].2H_2O $
B) $ Ca_2B_6O _{11}.5H_2O $
C) $ Ca{{(OH)}_2} $
D) $ Na_2B_4O_7.2H_2O $
Correct Answer: B
Colemnite is a mineral of boron having composition as $ Ca_2B_6O _{11}.5H_2O $ .
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