Question: what two materials were used to make the statue of athena

title: Athena Parthenos
text: ... The statue is created with ivory and gold . On the middle of her helmet is likeness of the Sphinx ... and on either side of the helmet are griffins in relief ... The statue of Athena is upright , with a tunic reaching to the feet , and on her breast the head of Medusa is worked in ivory . She holds a statue of Victory that is approx . Four cubits high , and in the other hand a spear ; at her feet lies a shield and near the spear is a serpent . This serpent would be Erichthonius . On the pedestal is the birth of Pandora in relief .