The following MOGRE classes are pure .NET classes (ported instead of wrapped).
So there's no performance penalty in using them extensively:

• Angle
• AxisAlignedBox
• Box
• ColourValue
• Degree
• FloatRect
• Math
• Matrix3
• Matrix4
• PixelBox
• Plane
• Quaternion
• Radian
• Ray
• Rect
• Rectangle
• Sphere
• Vector2
• Vector3
• Vector4
• VertexElement

Remarks:
The Ogre reference is similar, but some things are little different to use in Mogre.

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Alias: Mogre pure .NET classes