Mineral contained in `B_(12)` is

The most common mineral containing lanthanum is ................. .

The most common mineral containing lanthanoids is ................. .

The most common mineral containing lanthanoids is

A silicate anion in a mineral is a linear chain of three silicate tetrahedral units that share at corners. The silicate mineral contains A^(2+) " and " B^(2+) ions. The formula of that mineral is