Biotite
= Biotite
{wiki}
A family of sheet <silicate minerals> with variable iron–magnesium composition. <Phlogopite> is its magnesian endmember in the simplified Mg–Fe description.
= Biotite
{wiki}
A family of sheet <silicate minerals> with variable iron–magnesium composition. <Phlogopite> is its magnesian endmember in the simplified Mg–Fe description.