The endmember hornblende tschermakite (Ca₂(Mg,Fe²⁺)₃Al₂(Si₆Al₂)O₂₂(OH)₂) is a calcium rich monoclinic amphibole mineral. It is frequently synthesized along with its ternary solid solution series members tremolite and cummingtonite so that the thermodynamic properties of its assemblage can be applied to solving other solid solution series from a variety of amphibole minerals.