A Marble altar is a piece of furniture that can be built in the Chapel of a player-owned house with the Construction skill. It gives an extra 200% Prayer experience when a bone is used with it. With one mahogany burner lit, it gives 250% extra Prayer experience. With two lit mahogany burners, it will give 300% extra experience.

Building a marble altar requires 70 Construction, 2 marble blocks and 2 cloths. Creating a marble altar gives the player 1030 Construction experience.

Training Prayer with this altar is inadvisable as the Gilded altar requires only a few more Construction levels to build and provides more experience per bone.

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