No you have to create your own material.
Afaik, materials exported from ogre only support one diffuse texture.
But really, your material file (.j3m) should be like this
Material MyMaterial : Common/MatDefs/Light/Lighthing.j3md {
MaterialParameters {
Ambient : 0.500000 0.500000 0.500000 1.000000
Diffuse : 0.640000 0.640000 0.640000 1.000000
Specular 0.500000 0.500000 0.500000 1.000000
Shininess : 12.5
DiffuseMap : Textures/stygian_ore.jpg
NormalMap : Textures/stygian_ore_normal.jpg
}
}