From the contact aureole of the Tono granitic mass, four almandine-bearing hornfelses are chemically studied. Almandine, biotite and cordierite, representing the main ferromagnesian phases, occur in all of the hornfelses. Four almandines, two biotites and four hornfelses are chemically analysed. Almandines have a range from (Alm₈₂ Pyr₉ Spes₃ Gr₅ And₁) to (Alm₈₃ Pyr_ll Spes_l Gr₄ And_l). Their compositions are possibly representative as pyralspite to occur in hornfelses belonging to the amphibolite facies. Although chemical data of the hornfelses do not allways satisfy the main compositional requirements proposed by Chinner (1962) for garnet development in hornfelses, this result is mainly based upon the discordance between apparent bulk analyses and real chemistry of garnet-bearing part of the hornfelses with big garnet porphyroblast. If chemical condition is suitable, almandine stably occurs even in hornfelses.